1) Are there mod-chips for game-cube?! no there aint, and probably wont be none for a while
2) Is it possible to back up game-cube games, and on what DVD+Rs CDRS?? yes you could but no point since your gamecube cant read them without a modchip
3) Is there any site like
www.xbox-scene.com, but for game-cube? no there aint. but there are some sites that talk about gamecube developement. eg custom game, linux on gamecube, custom programs.