The Wii Backup Disc is a service disc apparently used inside Official Nintendo Repair shops to transfer personal data like savegames and console settings between Wiis as part of a repair. It's not entirely clear what it does; something it does *not* do -- even though it appears it might -- is allow VC games to be transferred between consoles. Instead, it transfers the license so that the user can redownload the games from Wii Shop Channel for free.
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