I'll share a story with you:
(when I saved on 1 file)
It was spring break...nothing to do but play video games and I just got FFVIII. so all week I only played FFVIII for at least 12 hrs a day, and I was hasty so I skipped a lot of battles. needless to say my gfs learned nothing and I was summoning them the whole way through until I got to Edea on disc 2 and got my ass kicked. I got so bored trying to beat her, that I decided to start a new game and do it right.
I overwrote my file.
and THEN the real horror struck (3 days later. end of break)
I still didn't do it right and ran into trouble fighting rajin and fujin on disc 3. On my little brother's next turn, instead of taking out my card and replacing it with his as he usually does, he stuck it in the second slot. When his turn was up he had to do somthing so i saved it for him...and blindly erased my file.

and...since The Spring Break that Never Was, I saved on several files.