All it would take is a few network attached storage devices with high-capacity 3.5" drives. If you have 8 drives per NAS, and each drive is 4 TB, you only need 2 NAS to store data with no redundancy or RAID 5, and 3 or 4 NAS for more redundancy.

P.S. 6 TB drives are now very common, and 8TB drives are widely available, but more expensive.

There's a subreddit dedicated to data hoarding. https://www.reddit.com/r/DataHoarder/

Storage got cheap and easy to manage for regular consumers over the last few years.