This is the exact same method as the previous guide, but instead of backup up the entire memory card, we will be backing up a single save file (gci) that you can inject back into your memory card later instead of overwriting the entire memory card.
1. Open the homebrew channel on your Wii and launch GCMM.
2. Click "A" to use your SD card as the destination for the save backup.
3. Click "-" to Enter "Backup Mode". To restore your save after editing it, you will need to press