MS Hyper-V virtual machines can be protected against data loss using the Backup Manager. Backups are performed at the host level.
If the Hyper-V data source is not available on a device due to the terms of service, you can install the Backup Manager on the virtual machine and backup the Files and Folders and System State data sources.
Due to the nature of Hyper-V backups, if you restart a backup a snapshot remains on the device. This is because the backup was unable to complete and remove the snapshot itself.
This can be deleted manually.
If the backup completes with errors on the Hyper-V, this does not mean the backup has failed, so we would recommend you attempt a test restore to ensure you can access the data. You will then need to fix the errors on the local device.