You can perform backups automatically based on the configuration for a hypervisor or VM group, or manually for a VM group or a specific VM.
The first backup of a VM is always a full backup. By default, all subsequent backups are incremental, capturing any changes to VM data since the last backup.
You can recover virtual machine data, even when the most recent backup was incremental.
Backups run based on the following options:
Initial full backup: When you use Guided setup to set up the Virtualization solution, use the Back up now option to perform a backup for the default VM group.
Scheduled incremental backups: The server backup plan that is assigned to a VM group includes a schedule for ongoing incremental backups. Those backups are performed automatically based on the schedule, without requiring any user action.
Manual backups: You can perform on-demand backups for a VM group or for a specific VM.
If backups cannot start immediately, the backup jobs are queued.
You can configure a Hyper-V hypervisor to perform IntelliSnap backups. From the snap copy, you can restore full VMs and restore guest files and folders.
What Gets Backed Up
Virtual machines (powered on or powered off)
VHD and VHDX files
Configuration files for the virtual machines
Metadata required for granular recovery of files (NTFS and ext3 volumes only)
VHDX formatted hard disks with sector size of 4K bytes without metadata
Hyper-V replica VMs that are stopped
What Does Not Get Backed Up
Hard links (only for disk-level backup)
Virtual machine smart paging files
Certain virtual machines in which Volume Shadow Copy Service (VSS) fails to create a shadow
Devices residing in a guest virtual machine over iSCSI or vHBA
Hyper-V replica VMs that are running
Page and swap files (Hyper-V Integration Services must be installed on guest VMs)
VM folders with compression enabled.
When VM folders with compression enabled reside on a virtual machine, the backup of that virtual machine fails. However, manual snapshots of the virtual machine complete.