If you are regularly taking Online or Offline backup of your servers on the Tape with HP Data Protector and if you want to check the Tape usage status then follow the below steps :
1. Login to HP Data Protector Server.
2. Go to Start >> All Program >> HP Data Protector >> Data Protector Manager.
3. In the Menu select the Devices & Media >> Devices >> Slots >> Select the Tape >> and click on the Usage.
There you will see the Tape Usage Graph. The Graph is with two colors which is RED and GREEN, The RED color indicates the Used Space and the Green Color indicates Free Space.
I think this will help you to check the Tape or Cartridge space utilization.