SnapShot Is Not Working in WPMU

I’m trying to find a solution that will allow me to backup a full WPMU site as well as the individual sites separately.

I ran SnapShot for the full backup and get this: An unknown response returned from Snapshot backup attempt. Aborting.

Any ideas? The time is set pretty low at 30 seconds and I don’t have access to change it. The memory limit can’t be changed from 64M either.

I thought I would also test a snapshot of the individual sites but don’t see a way to do that. Is this possible?