Thank you for looking that up. Hardware usually does not fail from one day to the next, so to me it appears like your HDD monitoring was insufficient in the wee

Thank you for looking that up. Hardware usually does not fail from one day to the next, so to me it appears like your HDD monitoring was insufficient in the weeks / months leading the full crash. It should have detected the disks going bad and allow you to request a replacement with 3 of 4 disks being good and then later a replacement of the second bad disk with 3 of 4 being good, no? > I asked if they mean data lost on this single disk or the whole array, they said; IMO this is the correct answer from Hetzner. They cannot know whether you run RAID 1 (which would be good), RAID 5 (which would have killed the array), RAID 6 (good) or RAID 10 (might or might not be good). Asking before replacing could possibly allow you to save data in case the disk is not completely dead, but rather has a bunch of faulty sectors only. The only issue I personally see is the bad English. I am German like Hetzner and even I have issues understanding that grammar.