Answer:
Copying games you don't own is illegal and I certainly don't encourage that sort of activity. However you are legally entitled to make copies of media that you have purchased. The Fair Use Act has a provision that allows for backups. I bought a guide from http://www.copygamez.com that showed me the exact steps I needed to take in order to backup my games and play them on my Wii.
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I always copy my Xbox games. You almost be successful and just need some backup software to complete the process. So I am sure the way I do is also suitable for copy Wii games. You can get more info from http://HowToCopyXbox360Games.org