XigmaNAS

I suggest integrating this, it should be relatively doable and it would make Time Machine-like local or remote backups much easier.

ZnapZend - zfs backup with mbuffer and ssh support
ZnapZend uses the built-in snapshot
functionality of ZFS for fully
consistent backups. For each fileset, a pre- and
post-snapshot command can be configured
to quiet down any software writing to
the fileset prior to snapshotting.

The software mentioned was improved with better support for local snapshot and send/receive to remote servers.
I still recommend it for the next release, it would be a way to improve the handling of snapshots.