But what if you want to back up the entire VM from outside of the guest OS? You might be tempted to use solutions such as snapshots or open file agents to perform this task, but that can lead to backups that may be not be reliable. The quickest way to create a backup of a Virtual Server VM is to first place the VM in saved state, then copy all of the VM-related files, and then resume the VM. The entire process may take only a few seconds and is generally limited to the speed of the file copy operation. Furthermore, you can use the Virtual Server COM API to script the entire process so it run automatically and based on a schedule.
Dig Deeper on Disaster recovery, failover and high availability for virtual servers
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