The problem with the Wii is that since it uses DVDs instead of cartridges, your games are prone to getting scratched... and many people have the ability to copy the games. This lead Nintendo to use a lot of copyright protection on their games, making it difficult to copy them illegally. However, it also made them incredibly difficult to copy your legally owned games as well, making it hard to back them up.
The protection that Nintendo uses on its games is known as encryption. This is where Nintendo create a special "language" which only the Wii and Nintendo can understand. They then translate all the game data into this language so that when you put the disc into your PC to copy it, it appears to be a jumbled mess. This means that if you want to copy Wii games, you need to get your PC to be able to read this encrypted language, so that it can copy the discs.
This encryption is the reason why many people buy mod chips for the Wii. Because if you use a disc that isn't encrypted, the Wii console will just ignore it because it thinks it's been illegally copied. This means that in order to play Wii games on your console without a mod chip, you just need to be able to copy the Wii discs perfectly, on a 1:1 basis.... and as you might have guessed, this is an incredibly hard thing to do; thanks to the fact that there are hardly any tools / techniques that can read Nintendo's encryption.
However, you can actually copy Wii games very easily with a tool called "GameBackupSystem". This tool has been created by an anonymous team, but we were able to backup and play 20+ Wii games with it. It copies your game discs perfectly, including the encyrption. This means that you can copy as many games as you want with the system, and then play them on your console without a mod chip.
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