NDMP, or Network Data Management Protocol, is a protocol invented by the NetApp and Legato companies, meant to transport data between NAS devices and backup devices. This removes the need for transporting the data through the backup server itself, thus enhancing speed and removing load from the backup server.
Most contemporary commercial, multi-platform backup software, such as Bacula, Amanda, CA ARCserve, EMC NetWorker, EMC Avamar, Symantec NetBackup, Backup Exec (since v11d), CommVault Simpana, IBM Tivoli Storage Manager, Hitachi Data Systems (HDS), Quest Software NetVault Backup, Zmanda, HP Data Protector and others support this protocol.