Wii U Nus -

The Nintendo Update Server (NUS) is the backbone of the Wii U's digital ecosystem, serving as the central repository for everything from system firmware updates to games and applications hosted on the Nintendo eShop. What is Wii U NUS Content?

What are NUS on Wii U?

Part 4: How to Use the Files (A Basic Workflow)

If you are looking to back up your games or play them on Cemu, here is the general workflow. wii u nus

• The Ticking Clock: Nintendo will eventually decommission the NUS. When they do, the ability to legally download Wii U system files and game patches will vanish.
• The "Title Key" Problem: Once the NUS goes offline, preservation will rely entirely on the illicit community who hoarded the encryption keys.