How come Snapshot freezes when it gets to backing-up plugins?

I purchased the Snapshot plugin and the first two times I used it it worked fine. Now,however, when I attempt to create a "Snapshot", it freezes when it gets to;
Files: : plugins/snapshot (this is where it froze today).

I didn't change any settings so I'm a bit confused.

Any help you can give will be greatly appreciated.

Ma[x]2