Server backup script using Duplicity and GnuPG

backup.sh

 #!/usr/bin/env bash
 
 _FTP_PASSWORD=""
 _FTP_USER=""
 _FTP_HOST=""
 _FTP_DIRECTORY=""
 _GPG_KEY=""
 _BACKUP_OUTPUT="$( mktemp )"
 _BACKUP_EMAIL=""
 _BACKUP_TYPE="incremental"
 
 if [ "$( date +%u )" -eq 1 ] ; then
      _BACKUP_TYPE="full"
      # Cleaning UP old backups // I use autofs to delete old backups, fixme: add FTP connection to delete old backups
      find /mnt/autofs/ftp/${_FTP_DIRECTORY}/ -type f -mtime +15 | xargs rm
      duplicity collection-status file:///mnt/autofs/ftp/${_FTP_DIRECTORY}/ | grep -Eo 'duplicity-.+[^,]' | tr ']' ' ' | tr ',' '\n' | xargs rm
 fi
 FTP_PASSWORD="${_FTP_PASSWORD}" duplicity ${_BACKUP_TYPE} --encrypt-key "${_GPG_KEY}" \
 --exclude=/proc \
 --exclude=/sys \
 --exclude=/mnt \
 --exclude=/tmp \
 --exclude=/dev \
 --exclude=/var/cache \
 --exclude=/var/tmp \
 / ftp://${_FTP_USER}@${_FTP_HOST}/${_FTP_DIRECTORY} 1>${_BACKUP_OUTPUT} 2>&1
 
 if [ -s "${_BACKUP_OUTPUT}" ] ; then
     if [ -n "${_BACKUP_EMAIL}" ] ; then
         mail -s "Backup on $(cat /etc/hostname)" -a"From: xxxx@xxx.fr" "${_BACKUP_EMAIL}" <${_BACKUP_OUTPUT}
         rm -f -- ${_BACKUP_OUTPUT}
     fi
 else
     exit 1
 fi
 
 exit 0