NetVault Backup stores the system data in a PostgreSQL database, which resides on the NetVault Backup Server
Netvault plugin for databases (NVDB) protects system data (such as configuration files, system settings, backup indexes, backup media information, jobschedule, license keys, and other data) stored in the NetVault Database. One can use this backup to
recover a functional NetVault Backup Server after a failure.
Here is a Video to Demonstrate How to Backup Netvault and Restore