Essentially all you need to do is install cIOS'es, a USB loader and you're good to go. I suggest browsing the guides section or grabbing ModMii, it will guide you through the process.
Okay I hacked it to play GameCube ios's,and it can read USB's,so my question is what application do I need to run any Wii backups?And what kind of things I would need to play them
You need a usb loader and a custom cios. Be careful though and read up PLENTY before you install a cios. If you do something wrong then it will brick your Wii!
The Wii games can go in the same usb drive as your gamecube games as long as it's fat32. The wii games needs to be in wbfs format in a folder called wbfs.
"Lemon Pound Cake" features Foreman singing about how the officers sought to find drugs in his home, but instead discovered lemon pound cake on the kitchen counter. https://www.youtube.com/watch?v=9xxK5yyecRo