NDS Backup - Nintendo DS ROMs Flash Carts
None of the linkers that have been released so far can backup nds roms so users have to depend on release groups like golden sun team to backup ds games for them.
First 2 working NDS rom backups have been made by GoldenSun Team.0001.Metroid.Prime.Hunters.First.Hunt.(U).(NDS_save).NDS
This rom has a 4k save type, you must use a NDS original cart that has the same 4k size save type in order to boot this rom, otherwise you will loose the game save data. 0002 - Super.Mario.64.DS.(U).(NDS_save).NDS backup rom.
64k save type - use a NDS original cart that has the same 64k size save
Existing NDS Backup solutions.
NeoFlash a.k.a. XGflash2 can be used for playing commercial nds roms. At thsi point all 3 of them.