Barracuda Backup's offsite replication port — outbound from the appliance, never inbound.
IANA registers 5120 as barracuda-bbs, the Barracuda Backup Protocol. Barracuda's documentation puts 5120-5129 in the outbound set a Backup appliance needs, using them to replicate data to Barracuda Cloud Storage or to a second Barracuda Backup device. The vendor is explicit that no inbound ports are required: the appliance always initiates the connection, and these ports cannot be proxied.
Expose with care
Allow it outbound from the backup appliance only. There is no reason for an inbound firewall rule on 5120, so a listener answering from the internet is not a normal Barracuda deployment.
$ nc -vz TARGET 5120Seen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.