You cannot append Symantec Online Storage for Backup Exec backup jobs to existing backup sets. All Symantec Online Storage for Backup Exec duplicate backup jobs are either new jobs or they overwrite existing jobs with expired overwrite protection periods.
See About media overwrite protection.
To view your Symantec Online Storage for Backup Exec account information, log on to the Symantec Protection Network Web site. You can view how much data you have used, among other things. If you configured Backup Exec to verify your backup jobs, you can also view the results on the Web site.
You can access the Symantec Protection Network Web site at the following URL: