This is an archive version of the document. To get the most up-to-date information, see the current version.Crash-Consistent Backup
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Crash-consistent backup is Veeam’s method of creating crash-consistent VM images. A crash-consistent image can be compared to the state of a VM that has been manually reset. Unlike offline backup, crash-consistent backup does not involve any downtime.
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Crash-consistent backup does not preserve data integrity of open files of transactional applications on the VM guest OS and may result in data loss. |
Crash-consistent backup is performed in the following way:
- Veeam Backup & Replication interacts with the Hyper-V host VSS Services and requests backup of specific VMs.
- The Hyper-V host VSS Writer notifies the VSS provider that volume snapshots can be taken.
- The Hyper-V host VSS provider creates a snapshot of the requested volume.
- The volume snapshot is presented to Veeam Backup & Replication. Veeam Backup & Replication reads VM files from the volume snapshot using one of two backup modes — on-host backup or off-host backup. After the backup is completed, the snapshot is deleted.
