If I use the Open File Add-On and a Backup Client license to backup my Exchange Server and/or SQL Server; is the backup data coherent?
Yes. Exchange Server 2003 and higher and SQL 2005 and higher are Volume Shadow Service (VSS) aware applications. When Backup for Workgroups uses the Open File Add-On to interact with VSS, one of the first steps performed in the backup process is to inform all VSS aware applications that a backup is starting. These VSS aware applications react to the initialization of the backup process by bringing their databases up-to-date on disk. For example, these VSS aware applications will play their logs, flush data from memory to disk, and place their databases in a clean state, ready for backup. Then, these VSS aware applications will start new logs after the backup completes. As a result, the databases that are backed up during the backup process have been prepared by Exchange and/or SQL to be in a “ready for backup state.
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