I vote for zfs needing a backup and restore command against a snapshot.

backup command should output on stderr at least 
Full_Filename SizeBytes Modification_Date_1970secSigned
so backup software can build indexes and stdout contains the data.

The advantage of zfs providing the command is that as ZFS upgrades or new 
features are added backup vendors do not need to re-test their code. Could also 
mean that when encryption comes a long a property on pool could indicate if it 
is OK to decrypt the filenames only as part of a backup.

restore would work the same way except you would pass a filename or a directory 
to restore etc. And backup software would send back the stream to zfs restore 
command.

The other alternative is for zfs to provide a standard API for backups like 
Oracle does for RMAN.

It would be very useful with snapshots across pools
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6916404
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