Let’s assume you have a standard Wii ISO file (either ripped from your own disc or acquired legally as a backup). Here is how to repack it into an optimized WBFS.
When you download a "Wii Repack" torrent or archive, you usually get:
By utilizing repacks, a modest 500 GB external hard drive can easily hold hundreds of Wii games instead of just a few dozen raw ISOs. How to Create and Manage WBFS Repacks