ZFS Snapshots are really handy - it takes root access to remove them and you can't delete them with the normal UNIX delete. IF you're sharing with Samba or NFS,

ZFS Snapshots are really handy - it takes root access to remove them and you can't delete them with the normal UNIX delete. IF you're sharing with Samba or NFS, there's no way for any remote user to be able to delete. You just go back to the last good version.