I have a drive I want to back up onto, but it also has other stuff. If I use SuperDuper (the free version for now), will it erase everything on the drive? I also have Retrospect Express, which does incrementals, but I'm not comfortable because I don't know or sure if I could recover the stuff or what. I've never tested it. It's better if I can boot it and see. I've made one bootable clone, but I put other stuff on the drive and I don't want to lose that if I redo the clone. I could always make a disk image and clone to that; I'd boot off the old clone and then open the image and restore that. It would save space if I could just redo it all though.