Volume Shadow Copy Service
In order to take a snapshot backup of Exchange 2003, you must use VSS, a new feature in Windows 2003. VSS enables you to take shadow copy backups, which are generally referred to as snapshots. A shadow copy is an exact copy of a volume or file at a specific point in time. VSS is not just for Exchange; it can be used for network shares, files, and disk volumes.
VSS works by combining three different components: requestors, writers, and providers. As you might expect, the backup application is the requestor. Currently, only some third-party backup applications can act as VSS requestors.[1] Windows Backup does not implement a VSS requestor. The backup application requestor asks VSS to take a snapshot backup. The writer ...
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