With the news about the eShop closing today, it's good to know there are options for backup. Did you know the Wii U can burn eShop games to DVD? : r /wiiu
OWC 16X DVD-R Media
Disco Compacto Dvd-R 16X Caja - Digitalife eShop
Gigamax CD-R Recordable Compact Disc Grade AA – Bayan eShop