Gecko OS is a normal Disc launcher. It can only run backups when you have DARKCORP installed. Because this app was not made to run backups, you can use it to play normal Wii games without installing a cIOS.

Installation of Gecko OS is very easy. The only thing you actually need to install is a channel of it. And even this is optional (as you can launch the app with the Homebrew Channel as well).