After you remove a Hyper-V virtual machine (VM) from Hyper-V Manager, backup operations fail if you do not update the dataset associated with the VM.

This issue occurs when you remove a Hyper-V VM from Hyper-V Manager and attempt a backup without modifying the dataset. Additionally, if you re-created a VM, you must modify the dataset. SnapManager for Hyper-V creates datasets based on the VM ID (GUID). The backup fails when a VM is deleted, removed, or re-created, which creates a new GUID. Although this does not trigger the failure of the entire backup process, if a VM is deleted, and then re-created with the same name, it is not automatically protected by SnapManager for Hyper-V.

Remove the VM from the dataset list of VMs, and add any re-created VMs to the dataset.