I know how you feel Sarah. Lost all my data before though not from a Harddisk failure but rather a theft of my laptop! Right now I use Apple's Timecapsule that saves an image of my whole laptop updated every hour. In any event of a laptop crash or theft (God forbid), I can run out to the store get a brand new laptop and have Mac clone everything over. But boy was I bummed out that time. Cheer up!