Does such a homebrew app exsist yet?

Hey, has anyone made or is making a app that would allow the Wii/GC to copy/upload Saves for GBA games using the GC-to-GBA Link cable?

If noone has made such, it would be a great app for someone to make. Basicly the Wii/GC app would run and launch a small app into the GBA to cross comunicate useing the Link Cable. Then the Wii app would allow backup to SDCards and USB Drives. Would be very usefull since GBA AR:Max aren't made anymore and aren't very reliable.

hmmm..that would be great..I would also like to see an app like that.
I can't think of anything that would prevent this from working, except unless we have not been able to make "contact" with a GBA with HB...