It is possible to copy Wii Fit save data from one Wii and use it on another. When I Googled for answers about this, I found several different answers. Some people said save files are tied to the Wii console itself, so although you could backup to SD Card, you couldn’t bring that data with you to another console. Others said you probably could, but they had never tried.

So I had to try for myself. And it worked just fine. I was able to take Wii Fit save data and bring it over to my cousin’s house to do a Body Test for the day, and get a stamp. Then I saved it back to my SD Card.

First, to backup your Wii Fit save data, insert an SD Card and copy the Wii Fit game file to the card. You also need to Transfer all of your personal MIis to a Wii Remote. If you don’t, the characters will turn into guests on your friend’s console.

On the friend’s console, go to the Mii Plaza first, and Transfer all of your Miis to their Wii (from your Wiimote).

Then, insert a blank SD Card. Copy their Wii Fit save data to it (if it exists). Then, erase their data from their Wii (make sure it’s backed up on their SD Card first!).

Remove their SD Card and insert yours. Copy your Wii Fit data to their Wii. Then go ahead and start and play Wii Fit with your save data.

You can simply reverse the process to transfer back.

Hope this helps!