Yikes... I'm knocking on wood right now for you, just to help ward off the evil "OHMYGOD all my data is GONE" computer demons. It's an
awful feeling.
That said, I'm overdue for a full backup of important files, too. I've only recently started taking it seriously again, thus the purchase of the DVD burner. CD's are fine, too...anything is better than no backups at all!
I'll start
a new thread in the general section to answer your last question, since it might generate a whole topic on its own.