OK, now data I have multiple copies of. I just don't feel that it is important to backup my system image. I'm the kind of guy that keeps installation media just laying around, anything goes wrong and I can do a clean install.
Just one note to that. I only own one computer and it is the computer that I am presently using to test out these previews. It is the computer that I use for all of my video and audio hobbys as well as my lifeline to the world. But I have several different ISOs laying in a drawer so I can start over anytime I want.