Hello,
You can schedule to duplicate the backup jobs on to the external drive.
The USB device should appear as a drive letter to the operating system. Then you need to create removable backup-to-disk folders on that drive.
Under the devices tab, go to Removable backup to disk folder option and then right click removable backup to disk option and select 'New backup folder'. Select the drive letter of the USB device for creating this backup folder. Then perform the backup or duplicate backup.
Refer to the following technote for step by step information on how to duplicate backup sets in Backup Exec v9.1
Technote:
http://seer.support.veritas.com/docs/255866.htm
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Thanks.