Oh no, it's OK. I don't install new homebrew often (because there are many clones of already-existing homebrew out there) and I only really install homebrew if it's something I want as a quality-of-life feature or replacing existing homebrew for homebrew that is better at its job. Also, why the heck are MLC files so large if they don't store user-downloaded data?!
the dumper on the wii u kept corrupting the BaristaIconDatabase.bin file, so it would error on that file during extracting. had to learn how to compile wfs-extract with a fix that allows locations with uppercase in them. otherwise, it will say it can't find the location. it worked though. I ftp'd the file over and injected it. now, no error when extracting the mlc.
Ohh, I see. So pretty much while the MLC includes everything, it counts blank space as something and just adds that to the pile too. But when it gets extracted, I guess it can tell which file are needed and which files where just place-holders to represent blank space. I wonder why they can't also just give us the user-generated content as well? Having things like save files and homebrew being saved would be pretty convenient. But I guess it makes sense if you think about it. What if you reflash the backup to your NAND and apart of it, you had CBHC? Would it have problems because it wasn't installed properly and bootloop the Wii U? These questions are purely hypothetical though.
you can get them with savemiii mod. it will mass dump them, but in order to inject them, you have to assign the saves a slot. when you mass dump, they all end up in the batch folder iirc. that's something I figured out.