Hello @Carmine Bollettino 

Can you confirm if the data was originally protected with Nutanix as well? 

If it is across Hypervisor’s, these are the ones we support: 

https://docs.metallic.io/metallic/cross_hypervisor_restores_vm_conversion.html

if the data was originally protected on the same type of hypervisor and you are moving them to a brand new one you have to configure the new Hypervisor and then it will be a valid target for restore by following these steps: 

Setup steps: 

https://docs.metallic.io/metallic/configuring_backups_for_nutanix_ahv.html
Restore steps: 

https://docs.metallic.io/metallic/restoring_full_virtual_machines_for_nutanix_acropolis.html

Kind regards

Albert Williams