I got a used cheap Wii U with 32 GB NAND. I created a backup of the NAND but when I compress it (.rar or .zip archive), the archive is still about 18 GB. The NAND is clean (format before hacking). A year ago I hacked a Wii U for a friend and after compressing the NAND the archive is only 3 GB. Is there a way to get the archive to 3GB? Thanks in advance