The most common scenario is that the disk(s) of the VM being processed cannot be attached to the VMware Backup Proxy, for example:
- The VM (Virtual Machine) being processed was added to the job through a standalone ESXi host (as opposed to through a vCenter Server), and the VM acting as VMware Backup Proxy is on a different ESXi host.
- The datastore containing the disks of the VM being processed is not accessible by the VMware Backup Proxy VM because the ESXi host the Proxy is running on cannot access that datastore.
- The VM being processed and the VMware Backup Proxy VM assigned to the task are in different vCenter Servers.
- The VM being processed and the VMware Backup Proxy VM assigned to the task are in different virtual data centers under the same vCenter Server.