"how can i know what are the data that is backed up onto a tape?
thanks"
-NBU 3.4 or 4.5? There is a big difference. Also, if you get a status 0 on your job, you backed up everything that you specified. If not, you will get a 1.
"is there a command to prevent the backup from append images to a tape which contains unexpired images ?"
- <install_path>VERITAS\NetBackup\bin\bpmedia -freeze -ev <media_id>
*This will freeze the media so that nothing attempts to use it. This way you need not remove it from your robot. You may unfreeze the media with the same command, different switch.
<install_path>VERITAS\NetBackup\bin\bpmedia -unfreeze -ev <media_id>