I know I'm not the only artist to feel compelled to keep every possible iteration and copy of his/her work. There's not really a lot of logic behind the practice, since it's all in the same folder and if I lose that folder, I lose all of it. There are actually some comics I did way back in 2006 which have completely vanished from any and all hard drives and from the Internet! It's really kind of scary how that's even possible.
Although, it's possible that this is for the best, I remember them being pretty good, and as long as it's impossible to look back at them, I was a goddamn prodigy.