Several tools and methods are available for backing up Wii Nand:
While people often talk about "downloading" a backup, the reality is a bit more complex because each Wii has unique encryption keys Wii Nand Backup Download
Select the (pointing from the chip to the SD card) and press Reset. Several tools and methods are available for backing
: Every Wii has unique encryption keys fused into its hardware. A Wii Nand Backup Download