Support provided solution: Resolved by the clean reinstall of the agent.

Please do the following:
1) Uninstall the software via Control Panel.
2) Remove configurations, logs etc. by deleting the respective folder:
C:\ProgramData\CloudBerryLab\CloudBerry Backup\
3) Please install the latest version of our Backup agent (v 7.8.2.280):
https://www.msp360.com/download.aspx?prod=cbbackup