A Quick Tutorial for how to install games on the Wii U that you download from the Nintendo eshop to help.
I *believe* that you can save games to an external hard drive, if you happen to have one laying around. That should offer the same portability.
Browse and buy digital games on the Nintendo game store, and automatically download them to your Nintendo 3DS system or Wii U console. Bestselling Games Find out · New Wii U Releases · Wii U Games and under.