1. Right-click on Dr. Web icon in system tray and go to Tools -> Settings:
   
2. Open the Firewall tab -> Applications;
3. Check Acronis applications, unselect Require confirmation... and set everything to Allow:
   

1. The easiest way to do this is to activate Interactive mode in Advanced setup > Personal firewall:
   
2. After this, when you start Acronis services, you will be prompted if these services allowed. Select Create rule, and Allow actions:
   

1. On the main screen go to Settings:
   
2. On the Network tab select Smart Firewall and configure Program rules:
   
3. Set Allow for Acronis processes:
   

1. Go Tools -> Firewall:
   
2. Open :Application Rules::
   
3. Allow :All connections to Acronis services:
   

Avira uses Windows firewall, though it has its own access to settings.

1. Go to Firewall -> Configuration:
   
2. Open Application rules:
   
3. Allow Acronis processes: