I'd really like to play some of the GameCube games you know -_-, since the Wii CAN play GameCube games from the main drive, I thought of asking if any backup loader can actually run GC games, well....do they?
Yes burned DVDs work fine with Disc Loaders like Neogamma most of the time. There are compability lists around the internet whet Games work and which not, like that one:http://wiki.gbatemp.net/wiki/GCOS_Gamecube_Compatibility_List. Some USB Loaders also have Disc Loaders build in, USB Loader GX for example (not sure about cfg-Loader at the moment, don't have my Wii at hand).
Some people here in the Forums are working on a GC USB Loader, but that isn't functional yet as far as I know. If you want to launch GC backups from a USB drive WODE is the only option at the moment.