I don't have half life 2 yet, and I was thinking about getting the source premier pack off of steam. It seems competively priced, and I would get it instantly. The only con I see to this is if I ever have to reformat would I lose the game and have to repurchase it? I prefer having hard copies of my games somewhere as my backups, and downloading HL2 through steam is convenient yet worrisome. Are my fears unreal? Or would I really have to repurchase the source pack if I ever reformatted or lost it in some other way?