Not familiar with the "disconnected" technique - does this mean you disconnect & reconnect your drive periodically? Sounds like a misuse of RAID features. What

Not familiar with the "disconnected" technique - does this mean you disconnect & reconnect your drive periodically? Sounds like a misuse of RAID features. What could possibly go wong? Eg. Reconnect the drive accidentally forgetting to mark others as bad and bye bye "backup"? Also, RAID controllers die sometimes. It's not pretty when that happens, which means you really need a backup of the whole array anyways. So technically RAID is not a backup because you are still not protected from that type of failure.