Thanks for pointing to that report - looks pretty neat.
But whether using the underlaying stored procedured "QS_StorageUsageBySubclients" or the mentioned "QS_BackendStorage" the question is yet unanswered:
How could it be, that when opening in the Admin Console the Backup Job History of a certain client and then total up the "Data written" columns of all the jobs listed, I get something completely different?
eg. the report shows 1455 GB, but the jobs counted all together far less than 100GB?
Either Commvault calculates something utterly wrong, or I got a misconception of jobs and storage comsumption (of which I hope the latter is the case ...)