Wii Nand Archive
If you own a Wii, your NAND chip could fail tomorrow. The process to create a is free, requires only an SD card, and takes one hour of patience. In exchange, you receive the ultimate insurance policy for your console and a golden ticket to high-fidelity emulation.
To restore a backup (only do this if your Wii is malfunctioning), select the in the BootMii options menu (red arrow pointing from the SD card to the chip). This will overwrite your current system memory with the archived version. BootMii Backup | Wii Hacks Guide wii nand archive
Here are the primary tools used to archive the NAND: If you own a Wii, your NAND chip could fail tomorrow