There are many ways to back up a Hyper-V VM. You could, of course, use the recipes in this chapter inside the VM to back up your VM's hard drive contents to a network drive. As an alternative, you could use WSB to backup an entire VM and restore it.
Regarding the WSB commands to use when backing up a Hyper-V VM, you have options. You can use the WSB cmdlets, as you have done so far in this chapter. Or, you can use the Wbadmin console application. Wbadmin is a Windows command line tool that pre-dates the PowerShell module. It has the advantage of being higher ranked in search engines—useful if you wish to learn more. You may also find Wbadmin simpler to use in practice. This recipe shows how to use Wbadmin to create a backup of your VM and then restore it.