I'll show you how to copy Wii games, so this doesn't ever happen to you again. First you'll need some special software that is able bypass an encrypted Wii game, you can do this with Game Copy Pro. You will than need an empty DVD or CD. Once your Wii game is done copying simply just burn it on to a CD using Game Copy Pro.
You can do this with all your Wii games and never worry about another Wii game ever getting damaged again as you will always have a backup.
I highly recommend that you only use Game Copy Pro as it will also be able to bypass security features on your Wii console which will allow you to play copied Wii games. You can use other burning software, but be warned with other game copying software you will also have to buy and install a mod chip on your Wii console - so unless you know how to do that or know somebody that will do it for you the easiest thing to do is just to get Game Copy Pro and avoid the technical stuff all together.
You'll be able to Copy Wii Games and tons of other games you have. Game Copy Pro also support PSX, PS2, PS3, XBOX, XBOX 360, and other consoles. With your copy you'll also get access to game downloads. The games you'll be able to download are Wii games, PS3 games, XBOX 360 games and other games and you'll also be able to burn those games also using Game Copy Pro.