SaTa has updated his Rain program for the NDS to r13. Rain is a homebrew utility used to backup your NDS game saves that are stored on the NDS cartridges. This new releases supports the M3 Adapter SD and some other devices too.
Supporting M3-SD.
Being hard it is not supported, it tried to make message.
WORKING: GBAMP (CF), M3-SD.
UNTESTED: M3-CF, SC-SD and SC-CF.
DOESN'T WORK: MK2/MK3.