Default apps like the Mii Channel or the Wii Shop Channel. Save Data: Your game progress and user settings.
Every Wii’s NAND is encrypted with a console-specific key. A NAND from another Wii will not work on your console unless you also have its unique OTP (one-time-programmable) region and key, which are not stored in the NAND dump. Without these, the NAND is essentially useless for restoration.