USB HD not found (Backup from USB to NAS)

Good morning,

I’m trying to backup from an external USB harddisk to my “My Clud EX2 Ultra” NAS.
I tried to connect it to both USB 3.0 ports on the back of the NAS, but the NAS doesn’t detect the hard drive.

My intention was to make a backup following the procedure described at the following link:
Thanks in advance if you can help me, Bye!

Could be a number of reasons the USB Hard drive is not detected

See the link below to troubleshoot your … My Clud :thinking: