Cloud: I use '84 so it wouldn't be compatible with an older version and I always keep files from failed or glitched projects. ya never know, right?
Mipey: I can't remember half of the stuff. It would a pain to twice set up a colour block matching system that notes them kinda like... uh think Bejeweled but with five and they don't have to be in a horizontal or vertical row, one just has to be next to the other.
Silent: I'd vote weird bug .
Thank you all, I'm going to be way more careful with my backups .