This might not be new information but here goes. I imported an archived snapshot from my #2 drive to #1 drive choosing the destination as <New Snapshot> Took about 20 minutes then I booted to it. While working in this snapshot, I screwed up my email program to the point it wouldn't work at all. Well, I thought, I'll just boot out of this snapshot, delete it and re-import it back again from the #2 drive. Wasn't necessary. I just imported the original one on the #2 drive into the one on #1 drive that I screwed up. Took less than 2 minutes to "reverse" update it undoing the damage I did to it after importing it the first time. Is that cool or what?