press start(select)+L+R+A(or b) all at the same time, its hot key function and a back up saver option will appear. meaning everytime you save in a game, you also have to save it or back it up to your memory card with the hotkey function if not you loose your save.
3ds still seems to be an emulation powerhouse with little to counteract it (what are you going to use? A phone... hah). To that end second hand prices are likely to remain for a while