I got a Qnap NAS with 4 bays, and I put 2.5" SSDs in them, because there's no noise with SSDs.
I then attach a big 16TB HDD externally to it, it is set to automatically run a backup on schedule when I'm sleeping. I used to do fancy RAID stuff but then I just realized it's not worth it. With a RAID setup if something fails you still need this exact NAS system to restore you data. Where as with my dumb external HDD even if the NAS unit catches on fire I can simply read stuff out of the HDD with any device because it's just exFAT
I suspect I am on the "noob" side of spectrum here with only ~2TB collection.
Got 1x Samsung 8TB 870QVO and just 3 random 1tb drive I have laying around. wanted to get more of these 8tb drives but they're like out of production, you can't even get them anymore, should've gotten two when I had the chance.