Originally Posted by Quay Cur
You could probably do it the same way you do backups of GBA games with GBA flashcarts: put the GBA game into the GBA slot, use a cart dumper app (like WRG NDS-GBA Dumper) to copy as much of the rom to RAM as possible, swap your flashcart in, copy that segment from RAM to flashcart, and repeat until you get all of it. It only takes a couple of swaps with 8MB GBA games, so it'd probably be a pain to do for the 60+MB DS roms with only 4MB of RAM (over a dozen swaps), but definitely not impossible, and if some compression is used when storing it in RAM you could cut down on the number of swaps by quite a bit.
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