Please look at our administration guide for instructions on adding physical tape devices or Virtual tape devices.
https://support.quest.com/technical-documents/netvault%20backup/10.0.1/administration%20guide/
https://support.quest.com/technical-documents/netvault-backup/10.0.1/administration-guide/15#TOPIC-229668
https://support.quest.com/technical-documents/netvault-backup/10.0.1/administration-guide/18#TOPIC-229682