VSS is able to safely back up open files by using application-specific Writers and their Components. A Writer is a process of an application or a service that works with VSS to freeze the application or service in preparation for a VSS backup. A Component is a group of files selected for backup, that are controlled by the application or service that is under the control of the Writer. An application-specific Writer understands how the application works, and what files and structures the application needs.
While an application is frozen, the Writer suspends writing activities on the original volume so that the files selected for backup (the Components) remain in a consistent state during the creation of the shadow copy. Although write activities are suspended during this time, the process is completely transparent to a user working on the selected application.
Note: For additional information about Writers and VSS backups and restores, see Application-Specific Guidelines.
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