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In order to install the backup software, you will need to install a few more tools for the Wii now that it is softmodded. Download the latest version of DOP-Mii as well the cIOS iauncher. Keep the file structure intact. Insert the SD card into the Wii and open the Homebrew channel. Run DOP-Mii from the list of programs and select “Install IOS36 (v3351) w/ FakeSign”. Select Yes when asked to Apply NAND permissions and download the patches from the internet server. Select Yes again when it prompts you to restore. When it completes, it will drop you back at the Homebrew channel. Remove the SD card and put it back in your PC. Keep the file structure intact. Insert the SD card back into the Wii and navigate to the Homebrew channel. Open the cIOS installer. Select IOS36 from the version options. Confirm by pressing A. After installing successfully, the program will ask you to press any button to restart the Wii. Plug your external hard drive into your computer. You will need to download a program that will format your hard drive to match the file system of the Wii. WBFS (Wii Backup File System) Manager is a free, open-source program that will properly format the drive.  Run WBFS Manager with your external connected, and select it from the dropdown menu in the program. Be sure to select the right drive, because all data will be lost when it is formatted. After formatting, remove the external hard drive from your computer and attach it to the Wii in the bottom USB port. Insert the SD card into your computer. Download the latest version of USB Loader GX free from the website. The site offers an executable file for download that will automatically put the files into the right section of the SD card. Once you’ve copied the files to the SD card, insert it in the Wii and open the Homebrew channel. Select USB Loader GX from the list of programs.

Summary:
Download the necessary software. Extract DOP-Mii onto the SD card. Extract the cIOS installer onto the SD card into the Apps folder. Select Network Installation. Prepare your external hard drive. Install the USB Loader. Launch USB Loader GX.