"Answer: Its not! Obviously Nintendo feel that their copy protection software is good enough to stop people from emailing each other games they have downloaded so why cant they use the same technology to store game saves on your pc?"
Is the nes, snes, n64 emulators and the software to download game going to be on the the rev or a disk? If it on a disk than you can have it so only on that disk can play the game so copying it wouldn't matter.