Scripts to perform ZFS hourly, daily and monthly backups using ZFS snapshot feature.

crontab

# ZFS Backups
3	0	*	*	*	root	sh /opt/sbin/zfs-backup.sh
2	1-23	*	*	*	root	sh /opt/sbin/zfs-backup-hourly.sh
33	10	9	*	*	root	sh /opt/sbin/zfs-backup-monthly.sh

zfs-backup.sh

set -e

two_days_ago=$( date -v-2d +%A )

pools=`zpool list -H -o name`
datasets=`zfs list -d 1 -H -o name | grep /`

for pool in $pools
do
	# Maly HACK ako sa vyhnut hlaske, ze snaphost s danym menom neexistuje.
	# Vytvorime si snaphost priamo na hlavny dataset poolu, ktory vzapeti
	# hned zmazeme.
	zfs snapshot $pool@$two_days_ago

	zfs destroy -r $pool@$two_days_ago
done

for dataset in $datasets
do
	zfs rename -r $dataset@yesterday $two_days_ago || echo "Failed to zfs rename $dataset@yesterday"
	zfs rename -r $dataset@today yesterday || echo "Failed to zfs rename $dataset@today"
	zfs snapshot -r $dataset@today
done

zfs-hourly.sh

set -e

hour=$( date +%H:00 )

pools=`zpool list -H -o name`
# BACKUP nesnapshotujeme kazdu hodinu, iba kazdy den.
datasets=`zfs list -d 1 -H -o name | grep / | grep -v BACKUP`

for pool in $pools
do
	# Maly HACK ako sa vyhnut hlaske, ze snaphost s danym menom neexistuje.
	# Vytvorime si snaphost priamo na hlavny dataset poolu, ktory vzapeti
	# hned zmazeme.
	zfs snapshot $pool@$hour

	zfs destroy -r $pool@$hour
done

for dataset in $datasets
do
	zfs snapshot -r $dataset@$hour
done

zfs-monthly.sh

set -e

# Tento skript je potreba pustat 9. v mesiaci a premenuje poslednu zalohu (pred 8. dnami) na aktualny mesiac.
# Vynechava BACKUP a /tmp.

month=$( date +%B )
eight_days_ago=$( date -v-8d +%A )

pools=`zpool list -H -o name`
# BACKUP a /tmp nesnapshotujeme kazdy mesiac.
datasets=`zfs list -H -o name | grep / | egrep -v 'BACKUP|/tmp' `

for pool in $pools
do
	# Maly HACK ako sa vyhnut hlaske, ze snaphost s danym menom neexistuje.
	# Vytvorime si snaphost priamo na hlavny dataset poolu, ktory vzapeti
	# hned zmazeme.
	zfs snapshot $pool@$month

	zfs destroy -r $pool@$month
done

for dataset in $datasets
do
	zfs rename $dataset@$eight_days_ago $dataset@$month || echo "Failed to zfs rename $dataset@$eight_days_ago $dataset@$month"
done

This set of scripts provides:

• rotating daily snapshots: today, yesterday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday
• rotating hourly snapshots: 01:00, 02:00, ... 23:00
• rotating monthly snapshots: January, February, ... December