Home > Data Protection > PowerProtect DD Series Appliances > Dell PowerProtect Data Domain with Veritas NetBackup - Configuration Guide > Overview
DD Virtual Tape Library (DD VTL) is a disk-based backup system that emulates the use of physical tapes. It enables backup applications to connect to and manage PowerProtect DD storage using functionality almost identical to a physical tape library.
Virtual tape drives are accessible to backup applications in the same way as physical tape drives. After these drives are created in a DD VTL, they appear to the backup application as SCSI tape drives.
The PowerProtect DD configured as a VTL Storage Unit is connected to one of the ports on an HBA on the NetBackup media server. The PowerProtect DD can be connected to the media server either directly or through a SAN switch.