I've got three of them and, as soon as the 500gb one goes on sale again, I'll get more. I carry two with me. One contains a complete backup of my laptop (which has a 320gb internal drive). As my laptop contains OEM Vista and I have no way to repair a corrupt system file, the backup gives me a way around system restore, in case I don't have restore points going back far enough. The other drive contains all my documents, serial numbers and downloaded software. That's also the one that I put movies on. These little drives are terrific!