When you talk about 'Media Usage', are you referring to how much is on each media, or how many media were used?
One handy way is to use the 'omnirpt' function, for example
omnirpt -report used_media -timeframe [start] [finish] Do not include the [ ] marks
So, for example, for the past 24 hours
omnirpt -report used_media -timeframe 24 24
Results are sent to standard output. You can also send this to e-mail in HTML format if you just want a report to look at
omnirpt -report used_media -timeframe 24 24 -html -smtp [e-mail address]
My own preference, especially if I need to extract information is to use the '-tab' qualifier
omnirpt -report used_media -timeframe 24 24 -tab -log C:\temp\last_24.txt
The output file can be imported into Excell
Used_media:
Lists destination media that have been used by backup, object copy, and object consolidation
sessions in the specific time frame together with their statistics. By default, the report is generated
for all session specifications. Use the report filtering options to generate a report only for a
specific backup, object copy, or object consolidation specification
There is also a Used_media_extended, which give a littel more information
Will this work for you? Maybe, or maybe this isn't what you are looking for. I advise you to click on Help -> Giudes in the GUI, open the CLI (Command Line Interpreter) Guide, in Section 1, find 'omnirpt'. There is a lot more there than I can possibly talk about
Also, nearly everything in 'omnirpt' can be configured as a Report in the GUI, and run as a scheduled actifity