In their jargon it’s called “scrub”. There are different arrangements, I have 3 disks under raid 5 or raidz 1. Data is written twice and every month I confirm checksums.
In the past I had lost photos on faulty disks, this solution provides me with techniques for coping and dealing in such scenarios.
I played that on a LOTR-themed felucca-only shard, and hosted a runUO server myself for friends later when no one was playing it anymore. Great memories, I kind of enjoyed the “blue vs. red” factions of the early game, like 1999.