You can only back up Diamond, Pearl or Platinum saves with an ARDSi (at some point they may bring out a new one that gets around the problem with HG and SS saves). You also need a Micro SD card to plug in the ARDSi for backing up the saves onto. You then need an USB Card Reader that accepts Micros SD cards (or get a Micro SD card with a normal SD card adaptor so that an SD card reader will do the job). Having read the card on the PC then you need to use the converter program. Cost for Cost, an ARDSi and Micro SD card and a means to read it on the PC probably works out the same as buying an NDS Adaptor Plus (which is by far the easiest to use anyway).