- I don't/didn't have room to back things up, and some of the things I used to have have disappeared. I've never lost anything like a phd thesis (never had one of those to lose...) but occasional things of some sentimental value. I found an old backup CD a few months ago which was fascinating...

Anyway, once you fail to back things up, lose stuff, and discover your life is going on much the same anyway, the motivation gets less...