I think any media should work. Check if your apps has the option and you can dump it or download it online.
Gecko OS doesn't seem to have an option that would do that kind of thing. I am at a lossI think any media should work. Check if your apps has the option and you can dump it or download it online.
you could also look at using nintendont to boot the game, and select virtual memory card which which will save to a file on the sd card