license key

Hi All,

I have very simple question.

For backup the two server's OS through network which license key we should use?

Of course one of them would be master server. I think Additional client license is enough.

What is the Enterprice license?

Now we didn't implement the netbackup soft  to the mentioned machines.

In future may be required to use the  flash backup ,if exist many small files.

Kindly can you provide me list of required licenses for our situations.

BR,

Turgun