Who are we?
We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.
We are one. We are legion. And we're trying really hard not to forget.
-- 5-4-3-2-1-bang from this thread
If I where you I would just buy a regular case that can fit a decent amount of HDDs like a fractal define 7 or one of its older versions and transplant your current computer into that with some new drives. 100tb is 5 20tb drives so you don't need that many.
USB enclosures are not a great way to handle storage as USB tends to be unreliable.