That's just why it's horrible to save constantly. I had one time in the first KH I saved for Riku II and Dragon Maleficent on a rather low level run, and it was hell getting through Maleficent. Later, I decided to delete the one before Maleficent, and I ended up deleting the wrong one because of same levels.
Also, for you all savers, do you people actually have a habit to go back and play your old saves again?