User`s guide

High Availability
All Barracuda Firewalls can now be deployed as part of a High Availability (HA) cluster. The primary unit handles all network traffic and security
functions, while the secondary unit waits in standby mode to take over if the partner unit fails. The secondary unit automatically inherits all
configuration changes from the primary unit.
You can only set up a HA cluster with two identical Barracuda Firewall models (e.g. two X101, two X200, or two X400) that run the
same firmware version. Both units must be licensed identically to prevent loss of security coverage in case of a failover. You can
configure HA on the page.ADVANCED > High Availability