Hi,
Ensure that Master backup is being backed up using full backup.
Please refer to the following technotes:
- "Final error: 0xa0008492 - Database Query Failure" is returned when backing up Microsoft SQL filegroups.
http://seer.support.veritas.com/docs/268220.htm
- "Database Query Failure. See the job log for details" (a0008492 HEX or e0008492 HEX) is reported during a restore of a SQL database
http://seer.support.veritas.com/docs/262416.htm
Make sure that you are not using AOFO in order to backup SQL backups. In order to isolate the issue, perform backups of one database at a time and verify the databse on which the backup is failing. Run DBCC on that databse and verify the results.
We hope this will help.
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Thanks.