It's a bad idea to backup the entire host with all VMs.
The best practice is:
1. Don't worry about backing up the host itself, as redeploying one takes little time (comparable with performing the restore). But if you do still want to back the host up, then use Veeam Agent for Windows excluding the volume that hosts your VMs.
2. Backup your VMs with the specialized VM backup product, such as Veeam Backup & Replication.