Backup Duplicity Script: perform files backup with `duplicity` tool, in local mode or through the network

backup-duplicity.sh

#!/bin/bash
#
# Backup file script.
#
# The backup is performed with `duplicity`,
# in local mode or through the network with
# SCP, SFTP.., so all the tools must be
# installed in both hosts (source and destination).
#
# The initial archive contains all
# information (full backup) and in the future
# executions only the changed information
# is added (incremental backup).
#
# To restore a backup, just executes the following
# command where the backup reside:
#
#    $ duplicity restore BCK_FOLDER <protocol>://PATH_DEST
#
# If we wanted to restore just the file "Mail/article"
# in /home/me as it was three days ago into
# a remote folder in user@host:/home/me/restored_file: 
#
#    $ duplicity restore -t 3D --file-to-restore Mail/article \
#          /backup/some_dir scp://user@host/home/me/restored_file
#
# See the `duplicity` home page for more information:
# http://duplicity.nongnu.org
#
# Author: (2014) Mariano Ruiz <[email protected]>
#

# List of source folders to backup.
# Each path must be quoted, and separated each other
# with a white space
FOLDERS=("$HOME/Desktop" "$HOME/Documents" "$HOME/Music")

# Destination folder (can be a remote address).
# The protocol must be specified, even it's a
# local path. Supported protocols:
# file:// (local), ftp://, sftp:// and scp://
# WARN: Use rsync:// protocol if the destination protocol is not 22,
# but the destination folder must be created before the first execute
# (rsync can't create folders like the others protocols).
# See: http://duplicity.nongnu.org
DESTINATION="file:///backup/"

# Duplicity command line options
DUPLICITY_OPTS="--no-encryption --volsize 100"

# Log file
LOG="$HOME/backup-duplicity.log"

# Date format printed into the log
DATE_FORMAT="+%Y-%m-%d %T"

echo "`date "$DATE_FORMAT"` INFO  : Starting file system backup ... " 2>&1 | tee -a $LOG

T_START=$(date +%s)  # To calculate the process time
EXIT_CODE=0
for f in "${FOLDERS[@]}"; do
	BASE_NAME=`basename "$f"`
	FULL_NAME="$DESTINATION/$BASE_NAME"
	echo "`date "$DATE_FORMAT"` INFO  : Doing backup of '$BASE_NAME'" 2>&1 | tee -a $LOG
	duplicity $1 $DUPLICITY_OPTS "$f" "$FULL_NAME" 2>&1 | tee -a $LOG
	EXIT_CODE=$(( (${PIPESTATUS[0]}) + ($EXIT_CODE) ))
done
T_DIFF=$(( $(date +%s) - $T_START ))

if [ "$EXIT_CODE" != "0" ]; then
	echo "`date "$DATE_FORMAT"` ERROR : ... File system backup done with errors (elapsed time `date -u -d @"$T_DIFF" +'%-Hh %-Mm %-Ss'`). Check the log above." 2>&1 | tee -a $LOG
	exit -1
fi

echo "`date "$DATE_FORMAT"` INFO  : ... File system backup done in `date -u -d @"$T_DIFF" +'%-Hh %-Mm %-Ss'`." 2>&1 | tee -a $LOG
exit 0