To offer the greatest flexibility, NetVault Backup can be licensed in two ways: by capacity or by component.
With the capacity-based model, licensing is based on the total amount of data being protected (the number of frontend terabytes of data on clients and NAS devices). Front-end TBs are calculated by totaling the amount of data on each client that will be included in all backup jobs. It does not matter how many times a week the data is backed up, how many copies are made, or how long that data is under management by NetVault. Customers have unlimited use of all product components included in each capacity offering for the number of TBs licensed. As their requirements grow, they can add additional client, application and device support as needed.
Component-based editions :-
With the component-based model, NetVault Backup is licensed based on the components required to meet the customer’s needs. Minimum requirements are one NetVault Backup server package (Starter or Enterprise) and one license for each client connected to the server. Additional licenses may be required for tape or disk target support, optional configuration components and application integration support. The benefit of this model is that customers can buy exactly what they need to meet their requirements.
White paper on the on the Netvault Technical over view:-
How to obtain licenses for Netvault products:-
For any more further queries please ref to https://support.quest.com/licensing-assistance or please email to license@quest.com .