is there anyway to convert wiiu partition back to fat32 or ntfs? if not is there anyway to backup the data before reformating?
the only way to backup the data is to transfer it to the wiius hdd or an sd card.
if you have an external hdd and sd card plugged in the wiiu will detect both and you should be able to transfer stuff between them. if not put it on the wiiu hdd 1st than over to the sd card. for your extra backup drive i don't know if it will detect more than 1 external hdd at once though i haven't tried.ouch.. thats going to take a while... do you know of a place that can tell how to do it?