You can get amazing deals on storage at different points in the year. I have a Seagate 16TB external hard disk that I bought during Black Friday sales of 2020 for about $270, half of your quoted price. Currently, it is $450 new.

At the reduced cost, we'd only need 7 of those for 112TB of storage, and that's $1890 + taxes, close to $2000. Not a lot of money for a backup of humanity's knowledge.