SQL script to count daily archive ingest rate in Megabytes

Hi All,

Can anyone here please assist me in modifying the following SQL script below ?

    SELECT "Archived Date" = LEFT (CONVERT (VARCHAR, archiveddate, 20), 10),
           "Daily Rate" = Count (*),
           "Av Size" = Sum (itemsize) / Count (*)
    FROM   saveset
    WHERE  archiveddate BETWEEN '2014-07-01' AND '2014-08-06'
    GROUP  BY LEFT (CONVERT (VARCHAR, archiveddate, 20), 10)
    ORDER  BY "archived date" DESC

So that it can display the total amount of Megabytes for all item archived between the date supplied.

The script above does not explains as to why the Open VaultStore partition lose 3 GB since yesterday.

Thanks in advance.