I don't know if this is common knowledge, but Order Of The Griffon lets you delete files when there isn't room to save, which happens pretty quick since OOTG's saves are friggin huge.
The thing I wanted to remind people of is that the game actually shows you the size of your Saves. This is effing priceless if you play a real Duo system.
Other than the obvious reason, this is a big deal because save sizes are all over the place.
Back in the day, I got up to 3 screens of Save files on my TG-CD(I don't know if it has more room than a Duo).
Once you get this high though, you start to get some phantom saves, often words with X values, ie: COSMIC_X instead of COSMIC_1 to COSMIC_4. Or just plain jibberish. My real files were never lost or damaged though.
Anyways, the thing is, there are a lot of Saves that take up all or like 3/4 of the back-up ram and if I remember correctly, too often they're for less desirable games.
With OOTG you can weed out the fatties so you can cram in more Tengai Makyo saves.