For VMs using the "Child VM Snapshot" method, the Hyper-V Volume Shadow Copy Requestor Service in the child VM processes the backup as detailed in Overview of Processing a Backup Under VSS. For each VM in the writer metadata, if the "Saved State" method is used, the VM is put into a saved state.The following procedure describes how to back up VMs. If the backup was done using the "Child VM Snapshot" method, there is additional processing done but it is not visible to the child VM. The unique behavior happens when the Hyper-V VSS writer (part of the "Hyper-V Virtual Machine Management" service) processes the PrepareForSnapshot event. In general, the process for backing up VMs is the same as described in Overview of Processing a Backup Under VSS. The Snapshot File Location for the VM is set to be the same volume in the host operating system as the VHD files for the VM.Īll volumes in the child VM are basic disks and there are no dynamic disks.Īll disks in the child VM must use a file system that supports snapshots (for example, NTFS). The child VM must be in the running state. Windows 2000: Backup Integration Service is not supported. The service name is "Hyper-V Volume Shadow Copy Requestor". For the "Child VM Snapshot" method to be supported, all of the following conditions must be met:īackup (volume snapshot) Integration Service is installed and running in the child VM. The other backup mechanism is called the "Child VM Snapshot" method, which uses VSS inside the child VM to participate in the backup. The default backup mechanism is called the "Saved State" method, where the VM is put into a saved state during the processing of the PrepareForSnapshot event, snapshots are taken of the appropriate volumes, and the VM is returned to the previous state during the processing of the PostSnapshot event. Hyper-V uses one of two mechanisms to back up each VM. If the backup (volume snapshot) integration services are installed in the guest operating system, a VSS requester is installed that will allow VSS writers in the guest operating system to participate in the backup of the VM.
Hyper-V uses the Volume Shadow Copy Service (VSS) to backup and restore virtual machines (VMs).
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