You need to soft mod or hard mod your wii to get the benifits of back up games.
A usb hdd is probably what you are going to have use to play your back ups from anyway as you probably have the newer drive chipset which will not allow you to play backups from disc. You can then rip your games through your wii drive to your ex hdd.
Make a post in the introduction section and someone will welcome you to the forum and give you a load of useful links to get you started. All I can say is read and learn..