Backup of External Drives
You can use Veeam Agent for Mac to back up data that resides on external USB/eSATA or FireWire drives connected to the Veeam Agent computer.
You can include in the backup scope specific folders with files that reside on an external drive. To do this, you must use the Veeam Backup & Replication console. To learn more, see the Creating Agent Backup Policy for Mac Computers section in the Veeam Agent Management Guide.