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
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Check how much of that stuff is actually needed to physically back up. Odds are it's on the cloud already. I got a house calls for this kind of thing a few times a day and almost always the answer is "your Apple/Google/Microsoft storage has all your pictures and videos already.
I get people that ask me about setting up network storage arrays pretty often, but almost none of them want to go through with it.
I don't know what your time is worth, and I would still set something up just because I felt like it or was curious, but almost nobody needs a home network storage system. Just figure out what people need to sync, set it up, and plug a hard drive into your router. Odds are once you try to figure out what they are trying to sink, you'll realize that it already has automatically synced to their cloud storage.
If you really want to do it as a project and are near Maryland, I will give you some closed box Network storage arrays from 2012 with hundreds of terabytes between them in unused fiber optic hard drives.