I am still hoping to get WiFi mode working as well, as soon as I find the time to look into FTP client mode. (If anybody is able to donate code or help in any other way, this would greatly accelerate things.)
My understanding of the "DSi Mode" feature is that it lets you back up to the DSi's SD instead of the microSD in the flashcard. As long as the homebrew runs on a slot-1 card in your DSi it should still be able to get the save.
I am still hoping to get WiFi mode working as well, as soon as I find the time to look into FTP client mode. (If anybody is able to donate code or help in any other way, this would greatly accelerate things.)
His only real roadblock thus far has been time - so here's hoping the rest of the app gets fleshed out in time
For now, am loving what it can do so far.
Word of caution to anyone else using it though - If you have a GBA Game/Save on your 3-in-1, make sure you backup your save from it before using the tool.
Lost my Monster Rancher 2 save, and I had JUST gotten White Hound (sad) but ah well. Lessons learned