> I struggle to generate more than a few hundred MBs per year.

You must not work with video.

Even with photography, a single raw photo can already use tens of megabytes (source: just looked at a raw photo file I happened to have around). A single raw video (or even a single already edited video) uses even more.

Now consider that you need at least twice that for redundancy (RAID-1 at the minimum). If you use things like Ceph for speed and redundancy, it's AFAIK recommended to have at least four separate nodes, each with its own storage.