Basically all it does is copy from EEPROM to FAT, and copy from FAT to EEPROM.
Super basic text UI.
Reads the game ID from the header to auto-name the backup save files.
There are a couple other basic features I will add (like support for SRAM, and a hex viewer)
It MAY work for some slot-1 card users, because I have a bunch of pauses in there (so you can insert the right card at the right time). But I've heard that it wont work for some cards because inserting the slot-1 flashcart causes a reset. (the reset never happens with a commercial game cart it seems, I can pop my metroid cart in & out all day long with no reset, so this is quite odd)
Let me know if it works, or if it wipes out your precious save games