This section will create a backup of your device's internal NAND memory on your SD card, which will allow you to restore your device via a hardmod in the case of a brick.
If you want a full backup including MLC, and have a black Wii U (32GB) model, your SD card must be at least 64GB in size. If you have a white (8GB) Wii U model, your SD card must be at least 16GB in size.
1. Copy `slc.bin`, `slccmpt.bin`, `otp.bin`, and `seeprom.bin`, and each `mlc.bin.part` file (if you chose to backup the MLC partition) from the root of your SD card to a safe location on your computer
+ Make backups in multiple locations (such as online file storage)
+ These backups will save you from a brick and/or help you recover files from the NAND image if anything goes wrong in the future