Hello,
To use the same media again for a backup that is set to overwrite the media, we need to ensure that the overwrite protection period (OPP) for that media has expired.
To understand this better please refer to the following technotes and try to create your own media sets and set up a media rotation cycle according to the number of media available, the backup retention time needed and frequency, type and size of backups:
1. The basics of Advanced Device and Media Management for VERITAS Backup Exec (tm) for Windows Servers
http://support.veritas.com/docs/192265
2. An explanation of the "Overwrite Protection Period" and the "Append Period"
http://support.veritas.com/docs/237374
3. How to create a media set in Backup Exec 9.x using the Media Set Wizard
http://support.veritas.com/docs/270516
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