you would also need to use a dump of your own specific cart for the header data to match your save.....so only real way to do this would be using gateway's launcher to dump the rom and the save to use with sky3ds, each cart has its own header info, which is used to tie the save to that cart......iirc the only games this wouldn't apply to are games using the 1.0 save encryption type....so pretty much just the launch titles, but yeah, dump rom, dump save, then figure out how to import the save to use with sky3ds
that only applies for 6.x save encrypted games, any games playable on 5.x and lower the saves will work perfectly fine between gateway and retail consoles.....only other issue is save size gateway only accepts 512kb saves, so unless the game has a 512kb save chip or is card 2 you cant use a retail save with gatewayThis save won't work in GW mode, at least until GW releases a save convertor, because GW uses a different encryption mode for the saves.
But the backup/restore do not affected by this i.e. it makes a complete backup of the current save regardless of the encryption which can be restored and played again in the same mode (realNAND or GW)