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.
With or without the robot? FWIW Beastie Boys already defeated the Backstreet Boys on February 4, 1999…