Source: https://cloud.netapp.com/blog/cvo-blg-ndmp-a-brief-history-architecture-and-common-topologies
Network Data Management Protocol (NDMP) is an open network protocol for controlling communications between your main storage and secondary storage systems. It is commonly used for NAS backup and recovery operations in heterogeneous network environments.
NDMP provides a shared architecture for backing up network file servers, making it possible to run backups on file servers running on multiple platforms, using one agent and centralized management software.
NDMP separates the control path from the data path, which reduces the demand on network resources and allows you to implement local backups and leverage remote systems for disaster recovery. NDMP also creates a standard way for file servers in heterogeneous networks to communicate with network-attached tape devices.
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Try rebooting!!! 