Yeah, I'm not stupid, thank you. If you read my post again you'll notice that I describe a RAID 1 (but leave out too much technical details as this targets all DokuWiki users not sys admins). You will also notice that I have experience with replacing faulty disks. The server had failures after replacing on disk. And it had to shut down for switching disks because they were not hotswappable. And finally you will also read that I restored some data from the backup we actually have. But thanks again for the lecture.