A catastrophe!
I was this box with two WD red 1TB disks to have a backup and a safe storage. The result was that the box failed (it was not detected by any computer), the hard drives worked without any problem, I tested them before sending the NAS back on a simple dock. I have to admit that I was not able to read the disks (even though they were in the same RAID 1 configuration), they did not appear anymore and I was asked to format them, which I obviously did not want to do. I took them to a computer shop to try and recover the data which did appear on the disk but no file could be read. So I paid 250€ for a safe storage and to be safe and as a result I lost all my data (including business data and photos) and I paid for a data recovery attempt, I am furious!