My entire HD, only 80GB filled, images (not clones) in under 20 minutes. Another copy of my data partition is also on a second computer.

I've been corresponding with the developer of ShadeSandbox, who has learned English as a 2nd language, so I'm not sure of what he's suggesting. He has minimum help and no forum on his site. :-(

Will look into VM. Wouldn't you have to update your VM constantly to keep up with your own changes?