ZFS backup

zfs_backup.sh

#!/bin/sh

BACKUP_ROOT=/mnt/backup

now=$(date +%s)
readable=$(date -d $now +%F)

backup_name="${readable}-${now}"

mount /mnt/backup

zfs snapshot -r zroot@${backup_name}
zfs send -R zroot@${backup_name} | gzip | dd of=${BACKUP_ROOT}/${backup_name} bs=1M

# Backup completed clean up old ones
backups=$(ls "${BACKUP_ROOT}")
for backup in $backups
do
    timestamp=$(echo "${backup}" | cut -d"-" -f4)
    if [ "${timestamp}" -lt "${now}" ]
    then
        echo "Removing ${backup}"
        rm  "${BACKUP_ROOT}/${backup}"
        zfs destroy -r zroot@${backup}
    fi  
done

umount /mnt/backup