About NetBackup storage units
NetBackup uses either one of the following storage units:
NDMP-type storage units (for local or three-way backup)
NetBackup requires NDMP-type storage units when you back up NDMP host data to the devices that are as follows:
Attached to an NDMP host
Available to the NDMP host on a SAN
An NDMP storage unit can contain standalone or robotic drives. Robotic controls can be in a TLD (tape library DLT), TL8 (tape library 8MM), TLH (tape library Half Inch), or ACS robot type.
Media Manager storage units (for backup to devices that are attached to a NetBackup media server)
You can use the drives that were configured in Media Manager-type storage units when you back up NDMP host data to devices that are as follows:
Attached to a NetBackup for NDMP server
Available to the server on a SAN
For NDMP backup, drives in Media Manager-type storage units do not have to be dedicated to NDMP data. They can store backups of regular (non-NDMP) NetBackup clients as well as of NDMP clients.