Docs for filesystem snapshots on FreeBSD 5.0?

[Per von Zweigbergk]

The new filesystem snapshot functionality in FreeBSD 5.0 seems very 
interesting to make it possible to consistently back up filesystems. 
However, I have found very little information about this when googling 
for this information.

The best I could come up with: dumping an active filesystem is best 
done with "dump -L", where -L activates snapshotting.

However, I have found no information about any utility similar to 
Solaris' fssnap on FreeBSD.

Any pointers?

-- 
Per von Zweigbergk <pvz at e.kth.se>