About the MongoDB roles for protecting the data
For completing NetBackup operations, the application user that you add in NetBackup must have the required roles. The required role must have permissions to access, query, back up, and restore all the databases and manage the cluster. It is recommended that you assign the user a root role.
Note:
Ensure that the same user is added for all the MongoDB nodes.
For more information about roles, refer to the MongoDB Manual.