i got my wii u 4 days ago and its already out of storage XD

i got my wii u 4 days ago and its already out of storage XD

Pro tip: get a usb storage device. An old HDD or a USB will work fine!
@Barrer thank you for the recommendation! I do have a 64gb sd card. Im saving up for a 256gb usb stick. do you think thats enough storage? My older brother has a 128gb usb stick.