First, welcome to the forums!
Are you talking about Veeam Backup & Replication? VBR cannot protect a Hyper-V host, only the VM's running on that host.
The only option to backup the host would be Veeam Agent for Windows (VAW, new name for VEB) but core is not a supported operating system. But even if it was a supported operating system, it wouldn't give you the protection you want/ need. You need to backup the DC and other application servers with application aware processing. Otherwise you might have the Hyper-V VHDX files (and config files) but nothing consistent to use in case you need to recover.
For your question on command line. Quite a lot of items can be done through PowerShell. We even have a dedicated forum for it
If I misunderstood the question, please let me know