Once you have the snapshot you can use it to create new VMs or copies of the VHD blob while the source VM can be powered on again. Snapshots can be used to duplicate a VM relatively quickly since it is faster than copying a blob. You still have to shutdown the source VM to ensure consistency but creating the snapshot only takes a few seconds.
These instructions are for Azure Resource Manager (ARM) virtual machines, for Azure Service Manager (ASM) virtual machines read this post. If you are looking for instructions to create and restore snapshots for unmanaged disks read this post. In post I’m going to take a look at creating and restoring Azure Virtual Machine snapshots for managed disks.
Francois Delport on Creating And Restoring Azure Virtual Machine Snapshots For Managed Disks.
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