Rolling back the whole file system to a previous snapshot

[Siju George]

Hi,

I am trying to test the amd64 port for a new backup server.
I was using the i386 port till then.

Have a few doubts.

How do I roll back a complete hammer file system to a previous snapshot?

I mean I take a snapshot of the hammer file system before I install
new packages etc.
And I mess up stuff and I want to roll back the entire hammer file
system to the snapshot I took?

also how do I set prune-min to a hammer file system? I only know how
to set it for a pfs :-(

thanks

--Siju