It is the source data which matters. From the Licensing Guide (which i urge you to read):

Source capacity is measured as the total capacity of data that is protected by the NetWorker software over a two-month period (60 days). This is irrespective of where the data is backed up, for example, to a tape, disk, VTL, Avamar Data Store, or Data Domain system: ...

Hi Bingo,

Thanks for your reply.

I have read the guide and from that I take that if I back it up today and never back it up again then after 60 days it is no longer counted as used capacity.

is this correct.

Thanks,

S

AFAIR nobody has ever mentioned the 'lifetime' of a volume licensed backup.

The idea behind the volume licensing is that it should cover the amount of all full backups. This is o.k. but larger manuals like RMAN backups will then be 'forgotten. And other tiny little details.

That's why you must install the EMC AMC Applicance which should do the calculation for you (EMC). These are the numbers they refer to.