chargeback source billing

Hi,

It appears that chargeback is only able to report/bill on data stored/transferred to the avamar grid. Is it possible to bill based upon source data?

For example if a vm image level backup was 1TB but only 50 GB was sent to the grid we would want to bill 1TB of usage either at a daily or monthly basis and could this be linked back to the retention period for the client?

We are currently running version 6.1 of Data protection advisor