Veeam Backup & Replication 9.5 Update 4
User Guide for Microsoft Hyper-V
Related documents

Backup of VMs on Local Storage and CSV

For backup of VMs on local storage and CSV, Veeam Backup & Replication leverages the Microsoft VSS framework and Microsoft Hyper-V VSS components. Veeam Backup & Replication acts as a Microsoft VSS requestor and communicates with the Microsoft VSS framework. It obtains information about available Microsoft VSS components from Microsoft VSS, prescribes what components Microsoft VSS must use, identifies volumes where VM files are located, and triggers the Microsoft VSS coordinator to create volume snapshots.

Before a snapshot of a volume is created, VMs on the volume must be quiesced: there must remain no incomplete transactions, open files and so on. Veeam Backup & Replication uses three methods to prepare Microsoft Hyper-V VMs for backup:

  • Online backup (also known as Child VM Snapshot method) — native Microsoft Hyper-V mechanism that allows you to create an application-consistent image of running VMs without any downtime.
  • Offline backup (also known as Saved State method) — native Microsoft Hyper-V mechanism that requires some VM downtime. To quiesce guest OS operations for a VM, Microsoft Hyper-V brings the VM to the save state (hibernates it).

Offline backup is not applicable to VMs registered on Microsoft Hyper-V Server 2016.

  • Crash-consistent backup — Veeam’s proprietary mechanism that allows you to create a crash-consistent VM backup. During crash-consistent backup, VMs are not brought to the saved state.

Whenever possible, Veeam Backup & Replication uses online backup to quiesce VMs. If online backup cannot be performed, Veeam Backup & Replication employs one of the other two methods to prepare a VM for backup.

  • If online backup is cannot be performed, Veeam Backup & Replication fails over to the crash-consistent backup.
  • If you do not want to produce a crash-consistent backup, you can instruct Veeam Backup & Replication to use the offline backup method.

Backup of VMs on Local Storage and CSV Note:

Veeam Backup & Replication does not fail over to the crash-consistent backup mode if you enable application-aware processing for a job and enable the Require successful processing option. In such situation, if application-aware processing fails, Veeam Backup & Replication will terminate the job with the Error status.

Related Topics

This Document Help Center
User Guide for VMware vSphereUser Guide for Microsoft Hyper-VEnterprise Manager User GuideVeeam Cloud Connect GuideVeeam Agent Management GuideVeeam Explorers User GuideBackup and Restore of SQL Server DatabasesVeeam Plug-ins for Enterprise ApplicationsPowerShell ReferenceVeeam Explorers PowerShell ReferenceRESTful API ReferenceRequired Permissions ReferenceQuick Start Guide for VMware vSphereQuick Start Guide for Microsoft Hyper-VVeeam Backup for AWS DocumentationVeeam Availability for Nutanix AHV DocumentationVeeam Backup for Microsoft Office 365 DocumentationVeeam ONE DocumentationVeeam Agent for Windows DocumentationVeeam Agent for Linux DocumentationVeeam Management Pack Documentation
I want to report a typo

There is a misspelling right here:


I want to let the Veeam Documentation Team know about that.