I came across "Wii NAND backup files download" while trying to restore a corrupted system. The site offered pre-made NAND backups for various Wii models and regions. Download speeds were slow, and the files lacked any checksums or verification. Worse, there's no guarantee these backups aren't tampered with or from a bricked console.
In case you need to restore your Wii from a NAND backup: Wii Nand Backup Files Download
The Wii will begin reading your NAND and writing it to the SD card. I came across "Wii NAND backup files download"
If you have to ask where to download a NAND backup, you are not at this skill level. This process requires soldering, hex editors, and deep cryptographic understanding. Worse, there's no guarantee these backups aren't tampered
If installed as IOS, launch the Homebrew Channel, press the button on your Wii Remote, and select "Launch BootMii."