What aspect of cpio do you need? The ability to swap cards when full? If you just need to pass the filenames, you could use xargs and cp find . -name "*.JPG" -print0 | xargs -0 -i cp {} /media/mmc2/images Hmm... does the n810 have xargs?
find -name "*.JPG" | while read foo; do cp $foo /media/mmc2/images; done