USB Backup failed frequently -WD PR4100

I have configured WD PR4100 in network and trying to sync data from PR4100 to WD USB.
but process start and after sometime gives error backup failed.

Tried with upgrading firmware, rebooting the device but the problem still same.

please help me to take backup on daily basis

Hi,

You could refer to the following link:

https://support-en.wd.com/app/answers/detail/a_id/5078