Hello,
In the third week when you take the next full backup, all the previous incrementals as well as the full backup become redundant and can be overwritten.
To increase the reliability you may copy the backup using the duplicate backup function to tapes since it is not advisable to rely on a single disk.
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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