Please help

"Hi everyone! I recently acquired a Wii that already has the Homebrew Channel and USB Loader GX installed. I'm looking to learn how to properly format my USB/SD card and the correct file structure to use so the loader recognizes my backups.

​Also, I’m a bit lost on the best way to manage these files safely. Any guidance on the setup process or a pointer toward a reliable guide would be greatly appreciated. Thanks!"