Virtual machine host names and display names should be unique if VMs are selected manually in the policy
Hyper-V servers do not require unique names for virtual machines. In a given Hyper-V server, two or more virtual machines can have the same host name or display name.
Identically named virtual machines can present a problem for any policies that are configured as follows:
The primary server's policies use the option on the Clients tab to select the VMs for backup.
The option on the Hyper-V tab identifies VMs by their host names or display names.
These policies may back up a different but identically named VM, instead of the VM that you selected. In that case, the VM that you selected is not backed up. For these policies to work, the virtual machines' display names or host names must be unique.
Consider the following options:
For manual policies that identify VMs by display name or host name, change the VM names so that each VM has a unique host name or display name.
As an alternative, configure the policies' option to identify the VMs by their VM GUIDs instead of by host name or display name.
Instead of policies with manual-selection, use a Hyper-V Intelligent policy to select the VMs through a query. Even if the option is set to host name or display name, NetBackup identifies each VM by its GUID.