As long as your'e playing on carts, you don't even need a memory card in the system, right? I've been sticking as much as I can to physical games on the Vita and while I have a 64GB card, I started hearing about failures a while back and now I'm all about owning the 8GB or 16GB cards. I was thinking though, as long as I'm just trying to use them for saves, I could probably pick up a 4GB as another backup.