Dilettanten-Alarm
Wenn einem der Hersteller einer Software Folgendes rät, dann weiss man, dass dort nur Dilettanten am Werk sind.
Most likely this is a firewall problem. Temporarily disable your firewall and attempt a backup. If the backup is successful, go to our step-by-step firewall guide to setup your <YourCompanyNameHere> client to work with your firewall software.
Thomas