The Wii U Network ID, similar to the gamertag on the Xbox 360, is linked to the Wii U which he is created. Gamers can log in with a different Wii You and touch their account lost if their Wii U goes down. There is no method to IDS to migrate.
In a faq on its site, which allows Nintendo that a user is not on another console can log in with his Nintendo Network account and that this account, therefore, is linked to the console on which it was created. According to the consolebouwer is it in future possible to have the ID to use on other devices such as a pc, but it can not be used on a different Wii U.
Who on a Wii U, a Nintendo Network account, you can use it to control up to 12 individual Nintendo Network IDS, so that a whole family to have a own ID may have on the device. Also with such an individual ID cannot be used to log in on another Wii U, so that, for example, of savegames is not transferred can be on a different console. This means that the account information of all the ID’s to be lost if the console goes down.
The Wii uses Nintendo a similar system. There can be a user account by the user to a different console to be moved. The customer service of Nintendo can that however. Or also for the Network ID of the Wii You are going to apply, is not known.
Wii U Direct – Nitendo explains how the storage of games works on the new console