FreeNAS Config Backup

backup-freenas.sh

#!/bin/bash

POOL="zpool1"
DATASET="backup/nas"
DB=freenas-v1.db
DB_HOME="/data"
BACKUP_HOME="/mnt/$POOL/$DATASET"
VERSIONS=10

exec 2> $BACKUP_HOME/backup.log
set -x

CURRDB_SUM=$(cksum $DB_HOME/$DB)
CURRDB_SUM=${CURRDB_SUM%% *}

BACKUPDB_SUM=$(cksum $BACKUP_HOME/$DB 2> /dev/null)
BACKUPDB_SUM=${BACKUPDB_SUM%% *}

# See if the checksum changed
if [ "$CURRDB_SUM" != "$BACKUPDB_SUM" ];
then
	cp -f $DB_HOME/$DB $BACKUP_HOME/$DB
	zfs snapshot $POOL/$DATASET@$(date +%y%m%d-%H%M)
	zfs list -t snapshot -o name -H -S name -r $POOL/$DATASET | sed -n "$((VERSIONS+1)),\$p" | while read snap
	do
		zfs destroy $snap
	done
fi