I have the same problem with MyCloud Mirror never completing a copy backup to an USB drive. Upgraded to 2.11.133 but it did not help. Finally, called support line today. Level 1 cannot do much except reboot and reset. Even remote desktop does not work for them today.
I ssh-ed into the device. Both the user’s share and an attached USB drive have links to them in /shares/ directory. I ran linux cp -r command, which copies files recursively, from user’s share to the USB drive. It completed fine. Ran diff after that and it found no differences. I don’t know what features backup from dashboard has but pure linux approach seems to work for my simple purpose of making a backup copy of the device. Of course, using dashboard would be simpler if it worked. Do you see any other downsides?
I wonder if backup from the dashboard creates any logs which may throw some light on the cause of the problem. Do you know where to look for them?
On the side note, I also had trouble with LED behavior which george_h mentioned. I thought the device stopped getting into a sleep mode after a firmware update last fall. It took level 2 support a month(!) to figure out that the new firmware changed LED behavior. New behavior with drive LEDs always on does not make much sense and I agree is annoying. How could they change an important part of user interface without even mentioning it in release notes?!
