Synthesized full backup sets miss some data if incremental backup and synthetic backup are executed after upgrading to Backup Exec 2012
When the Backup Exec is upgraded to Backup Exec 2012 with synthetic backup policy and an incremental backup and the synthetic backup are executed after the upgrade, the synthesized full backup sets miss some data. This issue reproduces only with remote server synthetic backups.
Please execute the baseline backup after the upgrade to Backup Exec 2012 in order to avoid this issue.
This issue is currently under investigation by Symantec Corporation. For more information please check the following article.