Well this is freaking me out! I got my DS the other day with the digital copy and it was fine. I took out the SD card to upload some pictures and forgot to put it back in. When it didn't pop up I panicked, but I realised it's on the SD card. So if my DS broke could I put the SD card in another DS and still have my data?
Yeah, if your DS ever broke I believe you can simply just take out the SD card and insert it into your new one.