After reboot of NVBU server the NetVault Backup services would not start.
In addition to the NetVault Process Manager there is a NetVault Backup PostgreSQL database server service that must be running. The account running this service, in Windows Network Service, must have at least Read and Execute permission to the <NetVault Backup root>\db folder.
Be sure the account used has the appropriate permissions. There is no reason to run this service as any other account. If the account was changed and you want to change it back use the Windows services.msc tool to change the logon account. When selecting this account you will see the normal user account selection window. You can blank out the password entries and click ok.