Hello,
1. each time you overwrite a tape it overwrites the data on tape and all the previous backups done to the tape are destroyed, this data can no longer be overwritten.
2. If you overwrite the full backups with the incrementals. neither of the backups will be availble to you. Full are unavailable since they are overwritten and the incrementals are useless without the Full backup.
Additional Information :
For information on the recent VERITAS Backup Exec security vulnerabilities, including links to the downloads for the necessary hotfixes, please refer to the following document:
Patch summary for Security Advisories VX05-001, VX05-002, VX05-003, VX05-005, VX05-006, VX05-007
http://seer.support.veritas.com/docs/277429.htm
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