HYPER-V GUEST BACKUP USING NATIVE BACKUP IN HOST SERVER

To successfully back up a hyper-v host with windows server backup. The Hyper-v vss writer needs to be registers with windows server backup.

Here is an article on virtualizationadmin.com that shows you how to do this manually.

But why do it manually when you can go here to click on fix it from microsoft and they will do it for you!