Things You'll Need
Instructions
Navigate to the USB Loader GX website and click on "Downloads" on the left side of the page. Click "View" under "Latest USB Loader GX (dol version)" and click on the appropriate revision for the USB Loader GX dol file you are downloading.
Rename the USB Loader GX dol file to "boot.dol" and place in the Apps folder on your SD card.
Launch the USB Loader GX and insert your Wii game into your Wii drive.
Press the "+" sign in USB Loader GX to install a new game to your USB drive attached to your Wii. USB Loader GX will automatically partition and shrink the game to fit onto your USB drive. You have now successfully performed an ISO backup on your Wii.