Never testing backups?
I know it's possible, but I have to ask "how can you never test a backup?" At the least, you try it out to get a file back or something. I backup everything on my computers between daily and once a month, and these backups have saved my butt more times than I can even remember. If you do backups on a regular basis, you can even get a file you accidentally delete or overwrite back without much effort. But I guess there are just some people who do a backup and assume that's all they have to do, then forget the thing even exists when they finally needed it.