The CPS-VO collaboration framework is hosted within a VMWare virtual machine.  Presently, we are running VMware ESXi version 5.

VMware, however, is not a strict requirement.  There are several open-source, or otherwise free, alternative hypervisors on the market.  

By using virtualization techniques the process of creating a clone of the VO is simply a matter of shutting down the virtual machine and copying a few files.