My predicament is that I have years-old save data on my Pokemon Sapphire cart that I'd like to back up and play with a DS lite Slot 2 cart. I have the means to load the rom and the save data onto my slot 2 cart, but I am unsure of how to back up the original save data from my retail Sapphire cartridge. Is it possible to do this? I would prefer software that can be run on my Slot 1 cart (a CycloDS running the latest firmware) that will back up the GBA cart's save to a file on the Cyclo, but if there is another method, I'd be willing to try it out. I'd like to keep my save data intact, but if there is a risk of losing it, it's not a big deal. I haven't played the game in years; I'm only doing this to say I can.
You might be able to. Go to www.linfoxdomain.com/ds and go under Essential Utilities and find the GBA Backup Tool. It runs from an Slot 1 card, like most NDS Homebrew, and can be used to backup GBA games, and I believe Saves. I've never tried it, but it should work.