If you are like me, constantly adding and removing software, then reloading your PC from scratch now and then is not always a bad thing. I usually find that I get very noticeable returns in speed increases every time I do it. Therefore I back up only my data and if my OS goes kaboom, I view it as forcing myself to do a much needed re-install anyways.

Still, this alternative view is not for everyone. Also, if I relied on my home PC for work, an instant solution would be much more valuable.

With great power comes Awesome irresponsibility.