I am glad you asked. The question to start with is what do YOU want to store? Narrowing it down would make this easier to determine what hardware you might need. For example, if you are storing video media for personal viewing, then an intel CPU with quicksync would be a great idea to have as it allows you to transcode your media on the fly with an app like plex, jellyfin, or emby.
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
If you are completely new, I would recommend a Synology. Very easy to use.
YouTube is your friend. So is piracy. And torrents. And a must, get cheap HDD's.
Why cheap hdds and not ssds?
HDDs are cheaper than SSDs per GB
Shuckable HDDs are even cheaper per GB
SSDs are unnecessarily expensive when you're looking at hoarding dozens or hundreds of terabytes of data. You won't be gaming off your drives you use for hoardings so there's really little benefit except in transferring stuff off them. Most of what people hoard tends to be media or documents which are find being played directly off even a slow modern HDD.