I think it's a good idea to make a backup in case nintendo patches online access and update service with emuNAND. Don't want to lose 6.3 if my SD Card goes corrupted. I did a backup of the whole SD Card with Win32 Disk Imager but it's too slow to do it regularly (it's 4 GB every time). Then I tried to backup only the 1 GB partition with a Partition Manager but because it's unallocated it doesn't let me. Would allocate the partition corrupt emuNAND data? Is there any program that can create an image of an unallocated "partition"?