The Amanda Enterprise NDMP Option supports all three NDMP topologies:
Direct NDMP : Where data flows directly from the NAS device to the tape drive
Three-way NDMP (aka Filer-to-Filer): Where data flows from the NAS device to a tape drive connected to another NAS device.
Remote NDMP : Where data flows through the Amanda Backup server to any media (tape, disk or cloud) supported by Amanda Enterprise.