SUMMARY
Which version of the VMware vSphere API does PHDVB use?
ISSUE
PHD Virtual Backup uses VMware's vSphere Web Services SDK 4.0 to interact with the hypervisor to perform backup, replication, and recovery tasks, like taking snapshots and creating new virtual machines.
Version 4.0 of the vSphere Web Services SDK is supported through VMware vSphere v5.1.