Gcmm is a project started by dsbomb and justb, which is based on Askot's modification to add SD support to the mcbackup libogc example.
I (suloku) have updated the code to newest libraries to port it to the Wii system, and what I find more important: restoring savegames now works properly.
[What's New 1.3 - september 14, 2012 - By suloku]
* Shows card/image serial number in Raw Restore Mode
* F-zero and Phantasy Star Online Ep I&II and Phantasy Star Online III savegames
are patched uppon restoring so they will work on target card (by Ralf)