I'd stay far away from Rollback RX. It seems like such a good idea, on paper, but it usually breaks down sooner rather than later. I purchased a copy way back when, and it eventually forced me to format and reinstall Windows again. Other people have
similar experiences. Their support is also horrid (meaning: more or less non-existing, though perhaps they've improved since I last tried it?). Personally I'm using
Macrium Reflect, and couldn't be happier. As for Acronis products, I've had mixed experiences with them. Back in the XP days, their system driver was causing me some trouble (BSOD's and performance-related), so I haven't tried their products since. Many people seem happy with them though.