So the cheapest storage server on czech-server has 14 drive spaces which makes it not enough for even RAID 5, so that means you need two which also means a 10GB NIC. That's 100k CZK for 1, using the cheapest 10TB drives they have. So that's 200k CZK.
Well, RIP Alvro's ROM collection.
https://www.czech-server.cz/hp-proliant-dl380e-gen8-16-core-1-80-ghz_x26059.html