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Microsoft Hyper-V Guest Quiescence

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    To create transactionally consistent backups and replicas for VMs that do not support Microsoft VSS (for example, Linux VMs), you must enable Microsoft Hyper-V guest quiescence for the job. In this case, Veeam Backup & Replication will use a native Microsoft Hyper-V approach to quiesce the VM. Microsoft Hyper-V guest quiescence helps freeze the file system and application data on the VM and create a stable shadow copy of the volume where VM data resides.

    To quiesce the VM, Veeam Backup & Replication can use the following methods:

    • Online backup (Microsoft Hyper-V method)
    • Offline backup (Microsoft Hyper-V method)
    • Crash-consistent backup (Veeam method)

    The quiescence method is selected in the following way:

    • If a VM meets all requirements for online backup, Veeam Backup & Replication will use the online backup method.
    • If a VM does not meet requirements for online backup, Veeam Backup & Replication will use the offline backup method. During offline backup a VM is suspended for a short period of time. If you do not want to suspend the VM, you can instruct Veeam Backup & Replication to create a crash-consistent backup instead of creating a transactionally consistent backup with the offline backup method.

    Microsoft Hyper-V guest quiescence is enabled at the job level for all VMs added to the job. By default, this option is disabled.

    Microsoft Hyper-V Guest Quiescence