In this case, configuring the “perform backup only” means that Veeam backup software will specify to the SQL writer to use the option VSS_BT_COPY rather than VSS_BT_FULL to preserve the log of the databases. The requestor may configure VSS_BACKUP_TYPE option by using the IVssBackupComponents interface and SetBackupState method. For those who like internal stuff you can interact with the VSS writers by specifying some options during the initialization of the backup dialog. Indeed, in this case, Veeam backup software relies on VSS framework and using process transaction log option doesn’t preserve the chain of full/differential backup files and transaction logs. This is a little detail that makes the difference here. In fact after checking out the Veeam backup software user guide, I noticed that my customer forgot to switch the transaction log option value to the “perform backup only” with application-aware image processing method. Just in case, did you have implemented a snapshot of your database server? And effectively the problem came from the implementation of Veeam backup software for bare-metal recovery purpose.
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