Copying online game saves to SD cards
I'm new here (obviously), but I am in sort of a desperate need for some sort of assistance. Unfortunately, my Wii is going through some very, very harsh artifacting--where black pixels appear on the screen because the Wii's GPU has overheated--and I'm sending it for repair very soon. However, I unfortunately can't copy over my online game saves to my SD card, like from Mario Kart Wii and Super Smash Bros. Brawl that I've spend countless hours playing. I have heard a few rumors about a Homebrew app that allows you to transfer online game saves, and if that is true then I would really love download that app and save my files before they the memory is wiped out during repair. I appreciate any assistance I get. Thank you.
And by the way, I have tried to find the answer to my question through Google, YouTube, you name it; I've just had no luck.