How does exchange vss work

Skip to content Call Us: BackupVault Knowledgebase. How VSS Works. Backup Tips. Shadow Copy Storage Area use Volume Shadow Copies can be used as a way of retaining multiple related versions of files.

Example disk usage flow diagrams The following examples use an Exchange database, but the principles equally apply to other databases. Any changes to the Exchange database are now tracked, with the original blocks copied to the Shadow Copy Storage Area. The unchanged blocks of the original files and changed blocks from the Shadow Copy Storage Area are read and compressed to the toBackup folder, taking up 25 GB. The compressed Exchange database copy is sent to the Storage Platform.

With the send complete, the compressed copy of the Exchange database is moved to the cache for comparison on the next backup, taking up 25 GB of local disk space.

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Microsoft Localization. Microsoft PnP. Healthcare and Life Sciences. Internet of Things IoT. Enabling Remote Work. Small and Medium Business. Humans of IT. Green Tech. MVP Award Program. Video Hub Azure. Microsoft Business. Microsoft Enterprise. Browse All Community Hubs. Turn on suggestions. This will open the Registry editor. You can locate items in the registry by using the search and browse functions. For more information on backing up and restoring Exchange Servers and mailboxes, see our Exchange documentation page.

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Classic Backups for Windows Servers. Objects can only be obtained for those components that have been explicitly added to this document by the IVssBackupComponents::AddComponent method. IVssBackupComponents::AddRestoreSubcomponents defines the subcomponents of an Exchange Server database that can be selected for a restore operation.

Exchange Server prohibits administrative actions against the databases, checks volume dependencies, and suspends all write operations to selected instance of the database and transaction log files while allowing read-only access. The VSS communicates with the appropriate storage provider to create a shadow copy of the storage volume that contains the Exchange Server databases. The VSS requestor verifies the physical consistency of the backup set prior to signaling the backup was successful.

Exchange Server truncates the transaction logs if the database is part of a DAG, log truncation is replicated among all the copies and records the time of the last backup for the database. Store Writer will be available on any Exchange Mailbox Server to provide the functionality to backup from and restore to the active copy of the database. Replication Writer will be available for use with copies of databases in a DAG.

Typically the majority of time spent working with the shadow copy is spent after the OnPostSnapshot , when the consistency of the shadow copy is verified prior to completion of the backups.