Game Cube and Wii games Backup?

Ok, I have a GameCube and a Wii. But I also have twin brothers who are 2. And they've broken 4 of my games. How do I back up my GameCube and Wii games, so if my little bros. get into my games and break/scratch them I still have the backups. Please Help!!!!!!

(plz tell me how 2 do it free)

Thanks!!
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