I backup my macs to an apple time machine. I haven't much used it, but it has always been a "just in case" item.
And today, I am restoring from back-up files given to me by an ex. I've released the anger, swallowed the guilt, and come to peace with myself about the areas where I wasn't enough for her. So now I'm going to finally go have a bo-peek at The Wire, and see what she was raving about.
So yeah, back up your files. Save your future you from your current stupidity. =)