diff --git a/PKGBUILD b/PKGBUILD
new file mode 100644
index 0000000..8a21647
--- /dev/null
+++ b/PKGBUILD
@@ -0,0 +1,32 @@
+#Arch Linux PKGBUILD
+#
+#Maintainer: Daniele Fucini <dfucini@gmail.com>
+#
+
+pkgname=simple-backup
+pkgver=1.4.r0.g97d1a14
+pkgrel=1
+pkgdesc='Simple backup script that uses rsync to copy files'
+arch=('any')
+url="https://github.com/Fuxino"
+license=('GPL3')
+makedepends=('git')
+depends=('python3'
+         'rsync')
+install=${pkgname}.install
+source=(git+https://github.com/Fuxino/${pkgname}.git
+        config)
+sha256sums=('SKIP'
+            'd8b88cbb4e6d9cae68c1605496880065337484dff8ee4c06dce2578357e95574')
+
+pkgver() 
+{  
+   cd "$pkgname"
+   git describe --long --tags | sed 's/\([^-]*-g\)/r\1/;s/-/./g'
+}
+
+package()
+{
+   install -Dm755 "${srcdir}/${pkgname}/${pkgname}" "${pkgdir}/usr/bin/${pkgname}"
+   install -Dm644 "${srcdir}/config" "${pkgdir}/etc/${pkgname}/config"
+}
diff --git a/README.md b/README.md
index 1a4febd..ff79de7 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 A simple backup script
 
 ## Description
-simple-backup is just a bash script that allows you to backup your files.
+simple-backup is a Python script that allows you to backup your files.
 It reads from a configuration file the files/directories that must be copied,
 the destination directory for the backup and a few other options.
 
diff --git a/config b/config
index 58b67ed..b95cb5b 100644
--- a/config
+++ b/config
@@ -11,5 +11,5 @@ backup_dir=/media/Backup
 #Exclude patterns. Use a comma to separate items
 exclude=.gvfs,.cache*,[Cc]ache*,.thumbnails*,[Tt]rash*,*.backup*,*~,.dropbox*
 
-#Number of snapshots to keep (default: keep all)
-keep=
+#Number of snapshots to keep (use -1 to keep all)
+keep=-1
diff --git a/simple-backup b/simple-backup
deleted file mode 100755
index 1e0b9b6..0000000
--- a/simple-backup
+++ /dev/null
@@ -1,489 +0,0 @@
-#!/bin/bash
-
-#Copyright 2017 Daniele Fucini <dfucini@gmail.com>
-
-#This program is free software: you can redistribute it and/or modify
-#it under the terms of the GNU General Public License as published by
-#the Free Software Foundation, either version 3 of the License, or
-#(at your option) any later version.
-
-#This program is distributed in the hope that it will be useful,
-#but WITHOUT ANY WARRANTY; without even the implied warranty of
-#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#GNU General Public License for more details.
-
-#You should have received a copy of the GNU General Public License
-#along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-#Simple backup script. Reads options, sources and destination from a configuration file or standard input
-
-#Help function
-function help_function {
-   echo "simple_backup, version 1.4.2"
-   echo ""
-   echo "Usage: $0 [OPTIONS]"
-   echo ""
-   echo "Options:"
-   echo "-h, --help                             Print this help and exit."
-   echo "-c, --config      CONFIG_FILE          Use the specified configuration file"
-   echo "                                       instead of the default one."
-   echo "                                       All other options are ignored."
-   echo "-i, --input       INPUT [INPUT...]     Specify a file/dir to include in the backup."
-   echo "-d, --directory   DIR                  Specify the output directory for the backup."
-   echo "-e, --exclude     PATTERN [PATTERN...] Specify a file/dir/pattern to exclude from"
-   echo "                                       the backup."
-   echo "-k, --keep        NUMBER               Specify the number of old backups to keep."
-   echo "                                       Default: keep all."
-   echo "-u, --user        USER                 User performing the backup."
-   echo "                                       Default: current user."
-   echo "-s, --checksum                         Use the checksum rsync option to compare files"
-   echo "                                       (MUCH slower)."
-   echo ""
-   echo "If no option is given, the program uses the default"
-   echo "configuration file: $HOMEDIR/.simple_backup/config."
-   echo ""
-   echo "Report bugs to dfucini@gmail.com"
-   exit 0
-}
-
-#Read configuration file
-function read_conf {
-   if [[ "$#" -eq 0 ]]; then
-      CONFIG="$HOMEDIR/.simple_backup/config"
-      
-      if [[ ! -f "$CONFIG" ]]; then
-         #If default config file doesn't exist, exit
-         echo "$(date): Backup failed (see errors.log)" >> $LOG
-         echo "Backup failed"
-         echo "Error: Configuration file not found" | tee $ERR
-         
-         #Fix ownership and permissions of log files if needed
-         if [[ ! -z $USER ]]; then
-            chown $USER:$USER $LOG && chmod 644 $LOG
-            chown $USER:$USER $ERR && chmod 644 $ERR
-            chown $USER:$USER $WARN && chmod 644 $WARN
-         fi
-
-         mv $LOG "$HOMEDIR/.simple_backup/simple_backup.log"
-         mv $ERR "$HOMEDIR/.simple_backup/errors.log"
-         mv $WARN "$HOMEDIR/.simple_backup/warnings.log"
-
-         exit 1
-      fi
-
-   else
-      CONFIG="$1"
-
-      if [[ ! -f "$CONFIG" ]]; then
-         #If the provided configuration file doesn't exist, exit
-         echo "$(date): Backup failed (see errors.log)" >> $LOG
-         echo "Backup failed"
-         echo "Error: Configuration file not found" | tee -a $ERR
-         
-         #Fix ownership and permissions of log files if needed
-         if [[ ! -z $USER ]]; then
-            chown $USER:$USER $LOG && chmod 644 $LOG
-            chown $USER:$USER $ERR && chmod 644 $ERR
-            chown $USER:$USER $WARN && chmod 644 $WARN
-         fi
-         
-         mv $LOG "$HOMEDIR/.simple_backup/simple_backup.log"
-         mv $ERR "$HOMEDIR/.simple_backup/errors.log"
-         mv $WARN "$HOMEDIR/.simple_backup/warnings.log"
-
-         exit 1
-      fi
-
-   fi
-
-   #Create temporary files
-   INPUTS=$(mktemp)
-   EXCLUDE=$(mktemp)
-   BACKUP=$(mktemp)
-   NKEEP=$(mktemp)
-
-   #Parse the configuration file
-   awk -v INPUTS="$INPUTS" -v EXCLUDE="$EXCLUDE" -v BACKUP="$BACKUP" \
-       -v NKEEP="$NKEEP" -v UHOME="$HOMEDIR/" -F '[=,]' \
-      '$1=="inputs" { for ( i=2; i<=NF; i++ ) { sub(/^~\//,UHOME,$i); print $i > INPUTS } }
-       $1=="backup_dir" { sub(/^~\//,UHOME,$2); print $2 > BACKUP }
-       $1=="exclude" { for ( i=2; i<=NF; i++ ) { sub(/^~\//,UHOME,$i); print $i > EXCLUDE } }
-       $1=="keep" { if ( $2 != NULL ) { print $2 > NKEEP } }' $CONFIG
-
-   BACKUP_DEV=$(cat $BACKUP)
-   KEEP=$(cat $NKEEP)
-   
-   rm "$BACKUP"
-   rm "$NKEEP"
-
-   if [[ -z "$BACKUP_DEV" || ! -d "$BACKUP_DEV" ]]; then
-      #If the backup directory is not set or doesn't exist, exit
-      echo "$(date): Backup failed (see errors.log)" >> $LOG
-      echo "Backup failed"
-      echo "Error: Output folder \"$BACKUP_DEV\" not found" | tee -a $ERR
-   
-      #Fix ownership and permissions of log files if needed
-      if [[ ! -z $USER ]]; then
-         chown $USER:$USER $LOG && chmod 644 $LOG
-         chown $USER:$USER $ERR && chmod 644 $ERR
-         chown $USER:$USER $WARN && chmod 644 $WARN
-      fi
-
-      mv $LOG "$HOMEDIR/.simple_backup/simple_backup.log"
-      mv $ERR "$HOMEDIR/.simple_backup/errors.log"
-      mv $WARN "$HOMEDIR/.simple_backup/warnings.log"
-
-      rm "$INPUTS"
-      rm "$EXCLUDE"
-
-      exit 1
-   fi
-
-   BACKUP_DIR=$BACKUP_DEV/simple_backup
-   DATE=$(date +%Y-%m-%d-%H:%M)
-
-   #Create the backup subdirectory using date
-   if [[ ! -d "$BACKUP_DIR" ]]; then
-      mkdir -p "$BACKUP_DIR/$DATE"
-   else
-   #If previous backups exist, save link to the last backup
-      LAST_BACKUP=$(readlink -f "$BACKUP_DIR/last_backup")
-      mkdir "$BACKUP_DIR/$DATE"
-   fi
-
-   #Set the backup directory variable to the newly created subfolder
-   BACKUP_DIR="$BACKUP_DIR/$DATE"
-
-   n_in=$(cat $INPUTS | wc -l)
-   
-   return
-}
-
-#Parse options
-function parse_options {
-   n_in=0
-   
-   #Create a temporary file to store inputs
-   INPUTS=$(mktemp)
-   #Create temp file to store exclude patterns
-   EXCLUDE=$(mktemp)
-
-   while [[ "$#" -gt 0 ]]
-   do
-      var="$1"
-
-      case "$var" in
-         -h | --help)
-            help_function
-
-            rm $INPUTS
-            rm $EXCLUDE
-
-            exit 0
-            ;;
-
-         -i | --input)
-
-            while [[ "$#" -gt 1 && ! "$2" =~ ^- ]]
-            do
-               input="$2"
-
-               if [[ ! -e "$input" ]]; then
-                 echo "Warning: input \"$input\" not found. Skipping" | tee -a $WARN
-               else
-                  n_in=$((n_in+1))
-                  echo "$input" >> "$INPUTS"
-               fi
-
-               shift
-            done
-
-            ;;
-
-         -d | --directory)
-            BACKUP_DEV="$2"
-
-            if [[ -z "$BACKUP_DEV" || ! -d "$BACKUP_DEV" ]]; then
-               echo "$(date): Backup failed (see errors.log)" >> $LOG
-               echo "Backup failed"
-               echo "Error: output folder \"$BACKUP_DEV\" not found" | tee -a $ERR
-
-               #Fix ownership and permissions of log files if needed
-               if [[ ! -z $USER ]]; then
-                  chown $USER:$USER $LOG && chmod 644 $LOG
-                  chown $USER:$USER $ERR && chmod 644 $ERR
-                  chown $USER:$USER $WARN && chmod 644 $WARN
-               fi
-
-               mv $LOG "$HOMEDIR/.simple_backup/simple_backup.log"
-               mv $ERR "$HOMEDIR/.simple_backup/errors.log"
-               mv $WARN "$HOMEDIR/.simple_backup/warnings.log"
-
-               rm $INPUTS
-               rm $EXCLUDE
-
-               exit 1
-            fi
-
-            BACKUP_DIR="$BACKUP_DEV/simple_backup"
-            DATE=$(date +%Y-%m-%d-%H:%M)
-
-            #Create the backup subdirectory using date
-            if [[ ! -d "$BACKUP_DIR" ]]; then
-               mkdir -p "$BACKUP_DIR/$DATE"
-            else
-               #If previous backup(s) exist(s), save link to the last backup
-               LAST_BACKUP=$(readlink -f "$BACKUP_DIR/last_backup")
-               mkdir "$BACKUP_DIR/$DATE"
-            fi
-
-            #Set the backup directory variable to the newly created subfolder
-            BACKUP_DIR="$BACKUP_DIR/$DATE"
-            shift
-            ;;
-
-         -e | --exclude)
-            while [[ "$#" -gt 1 && ! "$2" =~ ^- ]]
-            do
-               echo "$2" >> "$EXCLUDE"
-               shift
-            done
-            ;;
-
-         -k | --keep)
-            KEEP="$2"
-            shift
-            ;;
-
-         -c | --config)
-               rm "$EXCLUDE"
-               rm "$INPUTS"
-
-            read_conf "$2"
-            return
-            ;;
-
-         -u | --user)
-            if [[ ! -d "/home/$2" ]]; then
-               echo "$(date): Backup failed (see errors.log)" >> $LOG
-               echo "Backup failed"
-               echo "Error: user $2 doesn't exist" | tee -a $ERR
-                  
-               if [[ ! -d "$HOMEDIR/.simple_backup" ]]; then
-                  mkdir "$HOMEDIR/.simple_backup"
-               fi
-
-               #Fix ownership and permissions of log files if needed
-               if [[ ! -z $USER ]]; then
-                  chown $USER:$USER $LOG && chmod 644 $LOG
-                  chown $USER:$USER $ERR && chmod 644 $ERR
-                  chown $USER:$USER $WARN && chmod 644 $WARN
-               fi
-
-               mv $LOG "$HOMEDIR/.simple_backup/simple_backup.log"
-               mv $ERR "$HOMEDIR/.simple_backup/errors.log"
-               mv $WARN "$HOMEDIR/.simple_backup/warnings.log"
-
-               exit 1
-            fi
-
-            if [[ ! -d "/home/$2/.simple_backup" ]]; then
-               mkdir "/home/$2/.simple_backup"
-
-               echo "Created directory \"$HOMEDIR/.simple_backup\"." 
-            fi
-
-            HOMEDIR="/home/$2"
-            USER="$2"
-               
-            shift
-            ;;
-
-         -s | --checksum)
-            OPTIONS="-arcvh -H -X -R"
-            ;;            
-
-         *)
-            echo "$(date): Backup failed (see errors.log)" >> $LOG
-            echo "Backup failed"
-            echo "Error: Option $1 not recognised. Use 'simple-backup -h' to see available options" | tee -a $ERR
-
-            #Fix ownership and permissions of log files if needed
-            if [[ ! -z $USER ]]; then
-               chown $USER:$USER $LOG && chmod 644 $LOG
-               chown $USER:$USER $ERR && chmod 644 $ERR
-               chown $USER:$USER $WARN && chmod 644 $WARN
-            fi
-
-            mv $LOG "$HOMEDIR/.simple_backup/simple_backup.log"
-            mv $ERR "$HOMEDIR/.simple_backup/errors.log"
-            mv $WARN "$HOMEDIR/.simple_backup/warnings.log"
-
-            exit 1
-            ;;
-      esac
-
-      shift
-   done
-
-   return
-}
-
-#Create temporary log files
-LOG=$(mktemp)
-ERR=$(mktemp)
-WARN=$(mktemp)
-
-HOMEDIR="$HOME"
-OPTIONS="-arvh -H -X -R" 
-
-#Check number of parameters
-if [[ "$#" -eq 0 ]]; then
-   if [[ ! -d "$HOMEDIR/.simple_backup" ]]; then
-      mkdir "$HOMEDIR/.simple_backup"
-
-      echo "Created directory \"$HOMEDIR/.simple_backup\"." 
-      echo "Copy there sample configuration and edit it"
-      echo "to your needs before running the backup,"
-      echo "or pass options on the command line."
-
-      exit 1
-   fi
-
-   read_conf
-else
-   parse_options "$@"
-
-   if [[ $n_in -gt 0 && ( -z $BACKUP_DIR || ! -d $BACKUP_DIR ) ]]; then
-      #If the backup directory is not set or doesn't exist, exit
-      echo "$(date): Backup failed (see errors.log)" >> $LOG
-      echo "Backup failed"
-      echo "Error: Output folder \"$BACKUP_DEV\" not found" | tee -a $ERR
-   
-      #Fix ownership and permissions of log files if needed
-      if [[ ! -z $USER ]]; then
-         chown $USER:$USER $LOG && chmod 644 $LOG
-         chown $USER:$USER $ERR && chmod 644 $ERR
-         chown $USER:$USER $WARN && chmod 644 $WARN
-      fi
-
-      mv $LOG "$HOMEDIR/.simple_backup/simple_backup.log"
-      mv $ERR "$HOMEDIR/.simple_backup/errors.log"
-      mv $WARN "$HOMEDIR/.simple_backup/warnings.log"
-
-      exit 1      
-   elif [[ $n_in -eq 0 && -z $BACKUP_DIR ]]; then
-      if [[ ! -d "$HOMEDIR/.simple_backup" ]]; then
-         mkdir "$HOMEDIR/.simple_backup"
-
-         echo "Created directory \"$HOMEDIR/.simple_backup\"." 
-         echo "Copy there sample configuration and edit it"
-         echo "to your needs before running the backup,"
-         echo "or pass options on the command line."
-
-         exit 1
-      fi
-
-      read_conf $HOMEDIR/.simple_backup/config
-   fi
-fi
-
-if [[ $n_in -eq 0 ]]; then
-   echo "$(date): Backup finished (no files copied)" >> $LOG
-   echo "Backup finished"
-   echo "Warning: no valid input selected. Nothing to do" | tee -a $WARN
-               
-   #Fix ownership and permissions of log files if needed
-   if [[ ! -z $USER ]]; then
-      chown $USER:$USER $LOG && chmod 644 $LOG
-      chown $USER:$USER $ERR && chmod 644 $ERR
-      chown $USER:$USER $WARN && chmod 644 $WARN
-   fi
-
-   mv $LOG "$HOMEDIR/.simple_backup/simple_backup.log"
-   mv $ERR "$HOMEDIR/.simple_backup/errors.log"
-   mv $WARN "$HOMEDIR/.simple_backup/warnings.log"
-
-   exit 0
-fi
-
-echo "$(date): Starting backup" > $LOG
-echo "Starting backup..."
-
-#If specified, keep the last n backups and remove the others. Default: keep all
-if [[ -n $KEEP ]]; then
-   N_BACKUP=$(ls -l $BACKUP_DEV/simple_backup | grep -c ^d)
-   N_BACKUP=$(($N_BACKUP-1))
-
-   if [[ $N_BACKUP -gt $KEEP ]]; then
-     echo "$(date): Removing old backups" >> $LOG
-      echo "Removing old backups..."
-      REMOVE=$(mktemp)
-      find $BACKUP_DEV/simple_backup/* -maxdepth 0 -type d | sort | head -n $(($N_BACKUP - $KEEP)) >> $REMOVE
-
-      while read line
-      do
-         rm -r $line
-         echo "Removed backup: $line" >> $LOG
-      done<$REMOVE
-
-      echo "Removed old backups"
-
-      rm $REMOVE  
-   fi
-      
-fi
-
-# Sort input files for rsync efficiency
-if [[ ! -z "$INPUTS" ]]; then
-   sort "$INPUTS" -o "$INPUTS"
-fi
-
-echo "Copying files. This may take a long time..."
-
-if [[ -z "$LAST_BACKUP" ]]; then
-   rsync $OPTIONS --exclude-from="$EXCLUDE" --files-from="$INPUTS" / "$BACKUP_DIR" --ignore-missing-args >> $LOG 2>> $ERR
-else
-   rsync $OPTIONS --link-dest="$LAST_BACKUP" --exclude-from="$EXCLUDE" --files-from="$INPUTS" / "$BACKUP_DIR" --ignore-missing-args >> $LOG 2>> $ERR
-fi
-
-#Update the logs
-if [[ $(cat $ERR | wc -l) -gt 0 ]]; then
-   echo "$(date): Backup finished with errors" >> $LOG
-   echo "Backup finished with errors"
-elif [[ $(cat $WARN | wc -l) -gt 0 ]]; then
-   echo "$(date): Backup finished with warnings" >> $LOG
-   echo "Backup finished (warnings)"
-else
-   echo "$(date): Backup finished" >> $LOG
-   echo "Backup finished"
-fi
-
-#Fix ownership and permissions of log files if needed
-if [[ ! -z $USER ]]; then
-   chown $USER:$USER $LOG && chmod 644 $LOG
-   chown $USER:$USER $ERR && chmod 644 $ERR
-   chown $USER:$USER $WARN && chmod 644 $WARN
-fi
-
-#Copy log files in home directory
-mv $LOG "$HOMEDIR/.simple_backup/simple_backup.log"
-mv $ERR "$HOMEDIR/.simple_backup/errors.log"
-mv $WARN "$HOMEDIR/.simple_backup/warnings.log"
-
-if [[ ! -z "$EXCLUDE" ]]; then
-   rm "$EXCLUDE"
-fi
-
-if [[ ! -z "$INPUTS" ]]; then
-   rm "$INPUTS"
-fi
-
-if [[ -L "$BACKUP_DEV/simple_backup/last_backup" ]]; then
-   rm "$BACKUP_DEV/simple_backup/last_backup"
-fi
-
-BACKUP_DIR_FULL=$(readlink -f "$BACKUP_DIR")
-ln -sf "$BACKUP_DIR_FULL" "$BACKUP_DEV/simple_backup/last_backup"
-
-exit 0
diff --git a/simple-backup.py b/simple-backup.py
new file mode 100755
index 0000000..d54bac9
--- /dev/null
+++ b/simple-backup.py
@@ -0,0 +1,587 @@
+#!/usr/bin/python3
+
+# Import libraries
+from sys import exit, argv
+
+import os
+from os.path import expanduser, isfile, isdir, islink, exists
+from shutil import move, rmtree
+
+import subprocess
+
+from datetime import datetime
+from tempfile import mkstemp
+
+class Backup():
+
+    def __init__(self, *args, **kwargs):
+        super(Backup, self).__init__(*args, **kwargs)
+        
+        self.log_path = ''
+        self.logfile = None
+        self.err_path = ''
+        self.errfile = None
+        self.warn_path = ''
+        self.warnfile = None
+        self.homedir = ''
+        self.backup_dev = ''
+        self.backup_dir = ''
+        self.last_backup = ''
+        self.inputs = ''
+        self.inputs_path = ''
+        self.exclude_path = ''
+        self.exclude = ''
+        self.options = ''
+        self.user = ''
+        self.keep = -1
+        self.n_in = 0
+
+    # Help function
+    def help_function(self):
+        print('simple_backup, version 1.4.2')
+        print('')
+        print('Usage: {} [OPTIONS]'.format(argv[0]))
+        print('')
+        print('Options:')
+        print('-h, --help                             Print this help and exit.')
+        print('-c, --config      CONFIG_FILE          Use the specified configuration file')
+        print('                                       instead of the default one.')
+        print('                                       All other options are ignored.')
+        print('-i, --input       INPUT [INPUT...]     Specify a file/dir to include in the backup.')
+        print('-d, --directory   DIR                  Specify the output directory for the backup.')
+        print('-e, --exclude     PATTERN [PATTERN...] Specify a file/dir/pattern to exclude from')
+        print('                                       the backup.')
+        print('-k, --keep        NUMBER               Specify the number of old backups to keep.')
+        print('                                       Default: keep all.')
+        print('-u, --user        USER                 User performing the backup.')
+        print('                                       Default: current user.')
+        print('-s, --checksum                         Use the checksum rsync option to compare files')
+        print('                                       (MUCH slower).')
+        print('')
+        print('If no option is given, the program uses the default')
+        print('configuration file: $HOMEDIR/.simple_backup/config.')
+        print('')
+        print('Report bugs to dfucini@gmail.com')
+
+        exit(0)
+
+    # Function to read configuration file
+    def read_conf(self, config=None):
+        if config is None:
+            config = self.homedir + '/.simple_backup/config'
+
+            if not isfile(config):
+            # If default config file doesn't exist, exit
+                log_message = str(datetime.now()) + ': Backup failed (see errors.log)'
+                self.logfile.write(log_message)
+                self.logfile.write('\n')
+                print('Backup failed')
+                err_message = 'Error: Configuration file not found'
+                print(err_message)
+                self.errfile.write(err_message)
+                self.errfile.write('\n')
+
+                # Fix ownership and permissions of log files if needed
+                if self.user != None:
+                    pass
+#                   chown $USER:$USER $LOG && chmod 644 $LOG
+#                   chown $USER:$USER $ERR && chmod 644 $ERR
+#                   chown $USER:$USER $WARN && chmod 644 $WARN
+                
+                self.logfile.close()
+                self.errfile.close()
+                self.warnfile.close()
+            
+                move(self.log_path, self.homedir + '/.simple_backup/simple_backup.log')
+                move(self.err_path, self.homedir + '/.simple_backup/errors.log')
+                move(self.warn_path, self.homedir + '/.simple_backup/warnings.log')
+
+                exit(1)
+        else:
+            if not isfile(config):
+                # If the provided configuration file doesn't exist, exit
+                log_message = str(datetime.now()) + ': Backup failed (see errors.log)'
+                self.logfile.write(log_message)
+                self.logfile.write('\n')
+                print('Backup failed')
+                err_message = 'Error: Configuration file not found'
+                print(err_message)
+                self.errfile.write(err_message)
+                self.errfile.write('\n')
+
+                # Fix ownership and permissions of log files if needed
+                if self.user != None: 
+                    pass
+#                   chown $USER:$USER $LOG && chmod 644 $LOG
+#                   chown $USER:$USER $ERR && chmod 644 $ERR
+#                   chown $USER:$USER $WARN && chmod 644 $WARN
+         
+                self.logfile.close()
+                self.errfile.close()
+                self.warnfile.close()
+                
+                move(self.log_path, self.homedir + '/.simple_backup/simple_backup.log')
+                move(self.err_path, self.homedir + '/.simple_backup/errors.log')
+                move(self.warn_path, self.homedir + '/.simple_backup/warnings.log')
+
+                exit(1)
+
+        # Create temporary files
+        inputs_handle, self.inputs_path = mkstemp(prefix='tmp_inputs', text=True)
+        exclude_handle, self.exclude_path = mkstemp(prefix='tmp_exclude', text=True)
+
+        # Open temporary files
+        self.inputs = open(self.inputs_path, 'w')
+        self.exclude = open(self.exclude_path, 'w')
+
+        # Parse the configuration file
+        with open(config, 'r') as fp:
+            line = fp.readline()
+
+            while line:
+                if line[:7] == 'inputs=':
+                    line = line[7:].rstrip()
+                    input_values = line.split(',')
+                    n_in = 0
+                    for i in input_values:
+                        if not exists(i):
+                            warn_message = 'Warning: input "' + i + '" not found. Skipping'
+                            print(warn_message)
+                            self.warnfile.write(warn_message)
+                            self.warnfile.write('\n')
+                        else:
+                            self.inputs.write(i)
+                            self.inputs.write('\n')
+                            self.n_in = self.n_in + 1
+                elif line[:11] == 'backup_dir=':
+                    line = line[11:].rstrip()
+                    self.backup_dev = line
+                elif line[:8] == 'exclude=':
+                    line = line[8:].rstrip()
+                    exclude_values = line.split(',')
+                    for i in exclude_values:
+                        self.exclude.write(i)
+                        self.exclude.write('\n')
+                elif line[:5] == 'keep=':
+                    line = line[5:].rstrip()
+                    self.keep = int(line)
+
+                line = fp.readline()
+
+            fp.close()
+            self.inputs.close()
+            self.exclude.close()
+
+        # If the backup directory is not set or doesn't exist, exit
+        if self.backup_dev == '' or not isdir(self.backup_dev):
+            log_message = str(datetime.now()) + ': Backup failed (see errors.log)'
+            self.logfile.write(log_message)
+            self.logfile.write('\n')
+            print('Backup failed')
+            err_message = 'Error: Output folder "' + self.backup_dev + '" not found'
+            print(err_message)
+            self.errfile.write(err_message)
+            self.errfile.write('\n')
+
+            # Fix ownership and permissions of log files if needed
+            if self.user != None:
+                pass
+#               chown $USER:$USER $LOG && chmod 644 $LOG
+#               chown $USER:$USER $ERR && chmod 644 $ERR
+#               chown $USER:$USER $WARN && chmod 644 $WARN
+                
+            self.logfile.close()
+            self.errfile.close()
+            self.warnfile.close()
+        
+            move(self.log_path, self.homedir + '/.simple_backup/simple_backup.log')
+            move(self.err_path, self.homedir + '/.simple_backup/errors.log')
+            move(self.warn_path, self.homedir + '/.simple_backup/warnings.log')
+
+            exit(1)
+
+        self.backup_dir = self.backup_dev + '/simple_backup'
+        date = str(datetime.now())
+
+        # Create the backup subdirectory using date
+        if isdir(self.backup_dir):
+            # If previous backups exist, save link to the last backup
+            self.last_backup = self.backup_dir + '/last_backup'
+            if islink(self.last_backup):
+                self.last_backup = os.readlink(self.last_backup)
+            else:
+                self.last_backup = ''
+        
+        self.backup_dir = self.backup_dir + '/' + date
+        os.makedirs(self.backup_dir)
+
+        return
+
+    # Function to parse options
+    def parse_options(self):
+        # Create temporary files
+        inputs_handle, self.inputs_path = mkstemp(prefix='tmp_inputs', text=True)
+        exclude_handle, self.exclude_path = mkstemp(prefix='tmp_exclude', text=True)
+
+        # Open temporary files
+        self.inputs = open(self.inputs_path, 'w')
+        self.exclude = open(self.exclude_path, 'w')
+
+        i = 1
+        while i < len(argv):
+            var = argv[i]
+
+            if var == '-h' or var == '--help':
+                self.help_function()
+            elif var == '-i' or var == '--input':
+                val = argv[i+1]
+                while i < len(argv) - 1 and val[0] != '-':
+                    inp = val
+
+                    if not exists(inp):
+                        warn_message = 'Warning: input "' + inp + '" not found. Skipping'
+                        print(warn_message)
+                        self.warnfile.write(warn_message)
+                        self.warnfile.write('\n')
+                    else:
+                        self.n_in = self.n_in + 1
+                        self.inputs.write(inp)
+                        self.inputs.write('\n')
+
+                    i = i + 1
+                    val = argv[i+1]
+            elif var == '-d' or var == '--directory':
+                self.backup_dev = argv[i+1]
+
+                if not exists(self.backup_dev) or not isdir(self.backup_dev):
+                    log_message = str(datetime.now()) + ': Backup failed (see errors.log)'
+                    self.logfile.write(log_message)
+                    self.logfile.write('\n')
+                    print('Backup failed')
+                    err_message = 'Error: output folder "' + self.backup_dev + '" not found'
+                    print(err_message)
+                    self.errfile.write(err_message)
+                    self.errfile.write('\n')
+
+                    if self.user is not None:
+                        pass
+#                       chown $USER:$USER $LOG && chmod 644 $LOG
+#                       chown $USER:$USER $ERR && chmod 644 $ERR
+#                       chown $USER:$USER $WARN && chmod 644 $WARN
+
+                    self.logfile.close()
+                    self.errfile.close()
+                    self.warnfile.close()
+                    
+                    move(self.log_path, self.homedir + '/.simple_backup/simple_backup.log')
+                    move(self.err_path, self.homedir + '/.simple_backup/errors.log')
+                    move(self.warn_path, self.homedir + '/.simple_backup/warnings.log')
+
+                    exit(1)
+
+                self.backup_dir = self.backup_dev + '/simple_backup'
+                date = str(datetime.now())
+    
+                # Create the backup subdirectory using date
+                if isdir(self.backup_dir):
+                    #If previous backups exist, save link to the last backup
+                    self.last_backup = self.backup_dir + '/last_backup'
+                    if islink(self.last_backup):
+                        self.last_backup = os.readlink(self.last_backup)
+                    else:
+                        self.last_backup = ''
+        
+                self.backup_dir = self.backup_dir + '/' + date
+                os.makedirs(self.backup_dir)
+
+                i = i + 1
+            elif var == '-e' or var == '--exclude':
+                val = argv[i+1]
+                while i < len(argv) - 1 and val[0] != '-':
+                    exc = val
+                    self.exclude.write(exc)
+                    self.exclude.write('\n')
+
+                    i = i + 1
+                    val = argv[i+1]
+            elif var == '-k' or var == '--keep':
+                self.keep = int(argv[i+1])
+
+                i = i + 1
+            elif var == '-c' or var == '--config':
+                self.read_conf(argv[i+1])
+
+                i = i + 1
+            elif var == '-u' or var == '--user':
+                self.homedir = '/home/' + argv[i+1]
+                if not isdir(self.homedir):
+                    log_message = str(datetime.now()) + ': Backup failed (see errors.log)'
+                    self.logfile.write(log_message)
+                    self.logfile.write('\n')
+                    print('Backup failed')
+                    err_message = 'Error: user "' + argv[i+1] + '"doesn\'t exist'
+                    self.errfile.write(err_message)
+                    self.errfile.write('\n')
+
+                    if self.user is not None:
+                        pass
+#                       chown $USER:$USER $LOG && chmod 644 $LOG
+#                       chown $USER:$USER $ERR && chmod 644 $ERR
+#                       chown $USER:$USER $WARN && chmod 644 $WARN
+            
+                    self.logfile.close()
+                    self.errfile.close()
+                    self.warnfile.close()
+                    
+                    move(self.log_path, self.homedir + '/.simple_backup/simple_backup.log')
+                    move(self.err_path, self.homedir + '/.simple_backup/errors.log')
+                    move(self.warn_path, self.homedir + '/.simple_backup/warnings.log')
+
+                    exit(1)
+
+                if not isdir(self.homedir + '/.simple_backup'):
+                    os.makedir(self.homedir + '/.simple_backup')
+                    print('Create directory "' + self.homedir + '/.simple_backup".')
+
+                self.user = argv[i+1]
+
+                i = i + 1
+            elif var == '-s' or var == '--checksum':
+                self.options = '-arcvh -H -X'
+            else:
+                log_message = str(datetime.now()) + ': Backup failed (see errors.log)'
+                self.logfile.write(log_message)
+                self.logfile.write('\n')
+                print('Backup failed')
+                err_message = 'Error: Option "' + var + '" not recognised. Use "simple-backup -h" to see available options'
+                self.errfile.write(err_message)
+                self.errfile.write('\n')
+
+                # Fix ownership and permissions of log files if needed
+                if self.user is not None:
+                    pass
+#                   chown $USER:$USER $LOG && chmod 644 $LOG
+#                   chown $USER:$USER $ERR && chmod 644 $ERR
+#                   chown $USER:$USER $WARN && chmod 644 $WARN
+            
+                self.logfile.close()
+                self.errfile.close()
+                self.warnfile.close()
+                
+                move(self.log_path, self.homedir + '/.simple_backup/simple_backup.log')
+                move(self.err_path, self.homedir + '/.simple_backup/errors.log')
+                move(self.warn_path, self.homedir + '/.simple_backup/warnings.log')
+
+                exit(1)
+
+            i = i + 1
+
+        self.inputs.close()
+        self.exclude.close()
+
+        return
+
+    def exec_(self):
+        print('Copying files. This may take a long time...')
+
+        if self.last_backup == '':
+            rsync = 'rsync ' + self.options + ' --exclude-from=' + self.exclude_path +\
+                    ' --files-from=' + self.inputs_path + ' / "' + self.backup_dir +\
+                    '" --ignore-missing-args >> ' + self.log_path + ' 2>> ' + self.err_path
+        else:
+            rsync = 'rsync ' + self.options + ' --link-dest="' + self.last_backup + '" --exclude-from=' +\
+                    self.exclude_path + ' --files-from=' + self.inputs_path + ' / "' + self.backup_dir +\
+                    '" --ignore-missing-args >> ' + self.log_path + ' 2>> ' + self.err_path
+
+        subprocess.run(rsync, shell=True)
+        
+        return
+
+def main():
+
+    backup = Backup()
+
+    # Create temporary log files
+    log_handle, backup.log_path = mkstemp(prefix='tmp_log', text=True)
+    err_handle, backup.err_path = mkstemp(prefix='tmp_err', text=True)
+    warn_handle, backup.warn_path = mkstemp(prefix='tmp_warn', text=True)
+
+    # Open log files
+    backup.logfile = open(backup.log_path, 'w')
+    backup.errfile = open(backup.err_path, 'w')
+    backup.warnfile = open(backup.warn_path, 'w')
+
+    # Set homedir and default options
+    backup.homedir = expanduser('~')
+    backup.options = '-arvh -H -X'
+
+    # Check number of parameters
+    if len(argv) == 1:
+        # If simple backup directory doesn't exist, create it and exit
+        if not isdir(backup.homedir + '/.simple_backup'):
+            os.makedir(backup.homedir + '/.simple_backup')
+            print('Created directory "' + backup.homedir + '/.simple_backup".')
+            print('Copy there the sample configuration and edit it')
+            print('to your needs before running the backup,')
+            print('or pass options on the command line.')
+
+            exit(1)
+
+        # Read configuration file
+        backup.read_conf()
+    else:
+        backup.parse_options()
+
+    if backup.n_in > 0 and (backup.backup_dir == '' or 
+            not isdir(backup.backup_dir)):
+        #If the backup directory is not set or doesn't exist, exit
+        log_message = str(datetime.now()) + ': Backup failed (see errors.log)'
+        backup.logfile.write(log_message)
+        backup.logfile.write('\n')
+        err_message = 'Error: Output folder "' + backup.backup_dev.getBackupDev + '" not found'
+        backup.errfile.write(err_message)
+        backup.errfile.write('\n')
+
+        #Fix ownership and permissions of log files if needed
+        if backup.user is not None:
+            pass
+#            chown $USER:$USER $LOG && chmod 644 $LOG
+#            chown $USER:$USER $ERR && chmod 644 $ERR
+#            chown $USER:$USER $WARN && chmod 644 $WARN
+
+        backup.logfile.close()
+        backup.errfile.close()
+        backup.warnfile.close()
+        
+        move(backup.log_path, backup.homedir + '/.simple_backup/simple_backup.log')
+        move(backup.err_path, backup.homedir + '/.simple_backup/errors.log')
+        move(backup.warn_path, backup.homedir + '/.simple_backup/warnings.log')
+
+        exit(1)
+    elif backup.n_in == 0 and backup.backup_dir == '':
+        if not isdir(backup.homedir + '/.simple_backup'):
+            os.makedir(backup.homedir + '/.simple_backup')
+            print('Created directory "' + backup.homedir + '/.simple_backup".')
+            print('Copy there the sample configuration and edit it')
+            print('to your needs before running the backup')
+            print('or pass options on the command line.')
+
+            exit(1)
+
+        backup.read_conf(backup.homedir + '/.simple_backup/config')
+
+    if backup.n_in == 0:
+        log_message = str(datetime.now()) + ': Backup finished (no files copied)'
+        backup.logfile.write(log_message)
+        backup.logfile.write('\n')
+        print('Backup finished (no files copied')
+        warn_message = 'Warning: no valid input selected. Nothing to do'
+        backup.warnfile.write(warn_message)
+        backup.warnfile.write('\n')
+        print(warn_message)
+               
+        #Fix ownership and permissions of log files if needed
+        if backup.user is None:
+            pass
+#            chown $USER:$USER $LOG && chmod 644 $LOG
+#            chown $USER:$USER $ERR && chmod 644 $ERR
+#            chown $USER:$USER $WARN && chmod 644 $WARN
+        
+        backup.logfile.close()
+        backup.errfile.close()
+        backup.warnfile.close()
+        
+        move(backup.log_path, backup.homedir + '/.simple_backup/simple_backup.log')
+        move(backup.err_path, backup.homedir + '/.simple_backup/errors.log')
+        move(backup.warn_path, backup.homedir + '/.simple_backup/warnings.log')
+
+        exit(0)
+
+    log_message = str(datetime.now()) + ': Starting backup'
+    backup.logfile.write(log_message)
+    backup.logfile.write('\n')
+    print('Starting backup...')
+
+    #If specified, keep the last n backups and remove the others. Default: keep all
+    if backup.keep > -1:
+        dirs = os.listdir(backup.backup_dev + '/simple_backup')
+        if dirs.count('last_backup') > 0:
+            dirs.remove('last_backup')
+        n_backup = len(dirs) - 1
+
+        if n_backup > backup.keep:
+            log_message = str(datetime.now()) + ': Removing old backups'
+            backup.logfile.write(log_message)
+            backup.logfile.write('\n')
+            print('Removing old backups...')
+            dirs.sort()
+
+            err_flag = 0
+
+            for i in range(n_backup-backup.keep):
+                try:
+                    rmtree(backup.backup_dev + '/simple_backup/' + dirs[i])
+                    log_message = 'Removed backup: ' + dirs[i]
+                    backup.logfile.write(log_message)
+                    backup.logfile.write('\n')
+                except:
+                    err_message = 'Error while removing backup ' + dirs[i]
+                    backup.errfile.write(err_message)
+                    backup.errfile.write('\n')
+                    err_flag = 1
+
+            if err_flag:
+                print(err_message)
+
+    backup.logfile.close()
+    backup.errfile.close()
+    backup.warnfile.close()
+
+    backup.exec_()
+
+    # Update the logs
+    backup.logfile = open(backup.log_path, 'a')
+
+    if os.stat(backup.err_path).st_size > 0:
+        log_message = str(datetime.now()) + ': Backup finished with errors'
+        backup.logfile.write(log_message)
+        backup.logfile.write('\n')
+        print('Backup finished with errors')
+    elif os.stat(backup.warn_path).st_size > 0:
+        log_message = str(datetime.now()) + ': Backup finished with warnings'
+        backup.logfile.write(log_message)
+        backup.logfile.write('\n')
+        print('Backup finished (warnings)')
+    else: 
+        log_message = str(datetime.now()) + ': Backup finished'
+        backup.logfile.write(log_message)
+        backup.logfile.write('\n')
+        print('Backup finished')
+
+    # Fix ownership and permissions of log files if needed
+    if backup.user is not None:
+        pass
+#        chown $USER:$USER $LOG && chmod 644 $LOG
+#        chown $USER:$USER $ERR && chmod 644 $ERR
+#        chown $USER:$USER $WARN && chmod 644 $WARN
+    
+    backup.logfile.close()
+
+    # Copy log files in home directory
+    move(backup.log_path, backup.homedir + '/.simple_backup/simple_backup.log')
+    move(backup.err_path, backup.homedir + '/.simple_backup/errors.log')
+    move(backup.warn_path, backup.homedir + '/.simple_backup/warnings.log')
+
+    if islink(backup.backup_dev + '/simple_backup/last_backup'):
+        os.remove(backup.backup_dev + '/simple_backup/last_backup')
+
+    os.symlink(backup.backup_dir, backup.backup_dev + '/simple_backup/last_backup')
+
+    # Delete temporary files
+    os.remove(backup.inputs_path)
+    os.remove(backup.exclude_path)
+
+    exit(0)
+
+if __name__ == '__main__':
+    main()