Some time ago I moved from using LVM to using ZFS on my home server. This meant I also had to change the backup script I used to make backups on a remote Synology Diskstation. Below is the updated script. I also updated it such that it now needs a single command line argument: the hostname of the Diskstation to backup to (because I now have two Diskstations at different locations). If you want to run this script from cron you should set up key-based SSH login (see also here and here).

#!/bin/bash
#
# This script makes a backup of my home dirs to a Synology DiskStation at
# another location. I use ZFS for my /home, so I make a snapshot first and
# backup from there.
#
# This script requires that the first command line argument is the
# host name of the remote backup server (the Synology NAS). It also
# assumes that the location of the backups is the same on each
# remote backup server.
#
# Time-stamp: <2014-10-27 11:35:39 (L.C. Karssen)>
# This script it licensed under the GNU GPLv3.
 
set -u
 
if [ ${#} -lt 1 ]; then
    echo -n "ERROR: Please specify a host name as first command" 1>&2
    echo " line option" 1>&2
    exit -1
fi
 
###############################
# Some settings
###############################
# Options for the remote (Synology) backup destination
DESTHOST=$1
DESTUSER=root
DESTPATH=/volume1/Backups/
DEST=${DESTUSER}@${DESTHOST}:${DESTPATH}
 
# Options for the client (the data to be backed up)
# ZFS options
ZFS_POOL=storage
ZFS_DATASET=home
ZFS_SNAPSHOT=rsync_snapshot
SNAPDIR="/home/.zfs/snapshot/$ZFS_SNAPSHOT"
 
# Backup source path. Don't forget to have trailing / otherwise
# rsync's --delete option won't work
SRC=${SNAPDIR}/
 
# rsync options
OPTIONS="--delete -azvhHSP --numeric-ids --stats"
OPTIONS="$OPTIONS --timeout=60 --delete-excluded"
OPTIONS="$OPTIONS --skip-compress=gz/jpg/mp[34]/7z/bz2/ace/avi/deb/gpg/iso/jpeg/lz/lzma/lzo/mov/ogg/png/rar/CR2/JPG/MOV"
EXCLUSIONS="--exclude lost+found --exclude .thumbnails --exclude .gvfs"
EXCLUSIONS="$EXCLUSIONS --exclude .cache --exclude Cache"
EXCLUSIONS="$EXCLUSIONS --exclude .local/share/Trash"
EXCLUSIONS="$EXCLUSIONS --exclude home/lennart/tmp/Downloads/*.iso"
EXCLUSIONS="$EXCLUSIONS --exclude home/lennart/.recycle"
EXCLUSIONS="$EXCLUSIONS --exclude _dev_dvb_adapter0_Philips_TDA10023_DVB*"
 
 
 
###############################
# The real work
###############################
 
# Create the ZFS snapshot
if [ -d $SNAPDIR ]; then
    # If the directory exists, another backup process may be running
    echo "Directory $SNAPDIR already exists! Is another backup still running?"
    exit -1
else
    # Let's make snapshots
    zfs snapshot $ZFS_POOL/$ZFS_DATASET@$ZFS_SNAPSHOT
fi
 
 
# Do the actual backup
rsync -e 'ssh' $OPTIONS $EXCLUSIONS $SRC $DEST
 
# Remove the ZFS snapshot
if [ -d $SNAPDIR ]; then
    zfs destroy $ZFS_POOL/$ZFS_DATASET@$ZFS_SNAPSHOT
else
    echo "$SNAPDIR does not exist!" 1>&2
    exit 2
fi
 
exit 0