On-Host Backup

During on-host backup, VM data is processed on the source Hyper-V host where VMs you want to back up or replicate reside. All processing operations are performed directly on the source Hyper-V host. For this reason, on-host backup may result in high CPU usage and network overhead on the host system.

The on-host backup process includes the following steps:

1. Veeam Backup & Replication triggers a snapshot of the necessary volume.
2. The Veeam Data Mover Service uses the created volume snapshot to retrieve VM data; it processes the VM data and copies it to the destination.
3. Once the backup process is complete, the volume snapshot is deleted.

Assigning the Role of the On-Host Backup Proxy in CSV

In Veeam Backup & Replication, the role of the backup proxy is assigned to the Hyper-V host in CSV by the following rules:

• In case you perform backup or replication of VMs whose disks are located on the CSV in Microsoft Windows Server 2012 or Microsoft Windows Server 2012 R2 and Microsoft CSV Software Shadow Copy Provider is used for snapshot creating, Veeam Backup & Replication assigns the role of the on-host backup proxy to the Hyper-V host owning the CSV. If VM disks are located on different CSV's, Veeam Backup & Replication may use several on-host backup proxies, which are the corresponding Hyper-V hosts owning the CSV's.
• In case you perform backup or replication of VMs whose disks are located on the CSV in Microsoft Windows 2008R2 and a VSS software or hardware provider is used for snapshot creation, Veeam Backup & Replication assigns the role of the on-host backup proxy to the Hyper-V host on which the processed VM is registered.