Just get an 18-22TB external drive. Cheap easy and can be reused once you outgrow it. Yes, a NAS is pretty cool but unless you need the uptime etc RAID can offer you are just better of getting a single, large drive.
datahoarder
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
Just wanted to jump in here - I ended up doing as the commenter below me has said and bought a 20TB external hard drive. Well worth doing imo. I'm going to keep all of my important media that I want to save on the 5TB as a backup.