rotating backups (ZFS)

zfs snapshot alpha@now
zfs send -R -I alpha@latestBackup  alpha@now | zfs receive -F beta
zfs rename alpha@latestBackup alpha@backup-`date +%F`
zfs rename  beta@latestBackup  beta@backup-`date +%F`
#zfs destroy alpha@latestBackup
#zfs destroy  beta@latestBackup
zfs rename alpha@now alpha@latestBackup
zfs rename  beta@now  beta@latestBackup