Back. It. Up.
Take it from someone who has gone through two hard drives in as many years (thank you MacBook from hell – with battery temperatures to match – I don’t know why I still love you). Back up your work. E-mail your drafts to your parents. If they’re luddites, send them to someone else who will store them for you. Buy a jump drive and save it there once a day. Whatever.
Just DO IT.