To properly perform Hyper-V backup, including Hyper-V VM backups, you must protect at least at the host level to capture all Hyper-V VMs, their storage, data and configuration. To simplify these operations, backup software like Veeam Backup & Replication can coordinate the process for you and speak natively to Microsoft VSS to prepare the Hyper-V environment for backup. This integrated coordination ensures that consistent Hyper-V backups are taken, meaning that all data was captured during backup so that you can have a full spectrum of recovery options at your disposal to best meet your recovery objectives.
- To provide this consistency, Veeam Backup Manager queries information about VMs and virtualization hosts from Microsoft Hyper-V prior to backup.
Veeam Backup & Replication requests Microsoft Hyper-V VSS to create a cohesive point-in-time copy of a VM for backup. Microsoft Hyper-V VSS creates a volume snapshot or VM checkpoint, depending on the hypervisor version.
To keep Hyper-V backups manageable, Veeam Backup & Replication uses Changed Block Tracking (CBT) to retrieve only those data blocks that have changed since the previous job session.
After the backup proxy finishes reading VM data, Veeam Backup & Replication requests Microsoft Hyper-V VSS to perform cleanup operations.