There are many different methods to go about doing that but considering the protection some games have on them, as well as the different formats in which games can be formatted the easiest way to make perfect 1:1 copies of your games is to use CopyThatGame.
That being said, one might still be confused about what is the best method to backup Wii games. Furthermore the technical definition of copyright infringement involved some sort of profit from the product without the appropriate authors being repaid, which is not the case when you make copies of disks that you already own. After all if you are able to play a game long after the original disk has broken the company which issued it won't have to go through the trouble of dealing with your claims for a refund. As long as these wii backup copies are only as a back-up method for personal use this is perfectly legal and even encouraged. Luckily, there is a solution to this problem: make backup copies of your favorite Wii games. This means that after you have spent a nice sum on a Wii game you can expect it to stop working and you have no chance of getting our money back without going through a lot of hassle with the vendor of the game. Unfortunately, at this point, virtually no one will replace a Wii game for this type of damage since it is considered to be negligence on the user's part not a fault in the design of the disks and the way the Wii reads them. However, even the normal usage of sliding a disk into the game console or storing it can damage the game to the point where you may experience very slow refreshing or even frozen screens. Anything from dust to a small amount of water spilled on it can render a Wii game unreadable and if you live in a household that has children or pets the risk of accidental damage increases significantly.
Whether we want to accept it or not, disks are fragile objects that can easily break or get scratched to the point where they cannot be read.
How to Backup Wii Games - Own Your Wii Games Forever