Simple shell script to take daily ZFS snapshot and backup on different partition via bzip2

910.local-snapshot-zfs

#!/bin/sh
# For FreeBSD 8.x. Place this file in /etc/periodic/daily  and configure via periodic.conf
#
# If there is a global system configuration file, suck it in.
#
if [ -r /etc/defaults/periodic.conf ]
then
    . /etc/defaults/periodic.conf
    source_periodic_confs
fi

: ${daily_local_zfs_snapshot_tag=DAILY-}
: ${daily_local_zfs_snapshot_pool=rpool}
: ${daily_local_zfs_snapshot_backup_path=/bak/BACKUP/}
: ${daily_local_zfs_snapshot_backup_pre="mount /bak"}
: ${daily_local_zfs_snapshot_backup_post="umount /bak"}

BAKPATH=${daily_local_zfs_snapshot_backup_path}
POOL=${daily_local_zfs_snapshot_pool}
TAG=${daily_local_zfs_snapshot_tag}
SNAP=$TAG`date +%Y-%m%d-%H%M`

case "$daily_local_zfs_snapshot_enable" in
    [Yy][Ee][Ss])
echo
echo "Daily ZFS snapshot:"
	zfs snapshot -r $POOL@$SNAP
	echo Snapshot $POOL@$SNAP taken
	LAST1=`zfs list -t snapshot -o name -d 1 |fgrep $TAG |sort |tail -1`
	LAST2=`zfs list -t snapshot -o name -d 1 |fgrep $TAG |sort |tail -2|head -1`
	LAST2AT=`echo $LAST2 | sed -e s/.*@//`
	LAST1AT=`echo $LAST1 | sed -e s/.*@//`
	BAKFILE="$BAKPATH$POOL@$LAST2AT+$LAST1AT.bz2"
	${daily_local_zfs_snapshot_backup_pre}
	if [ ! -e $BAKFILE ]
	then
  	   zfs send -R -i @$LAST2AT $LAST1 |bzip2 -9 > $BAKFILE
	   echo Backup file: $BAKFILE
	fi
	${daily_local_zfs_snapshot_backup_post}
	rc=0
	;;

    *)
	rc=0
	;;
esac

exit $rc