That's why you manage the VMs with a configuration convergence tool such as Chef or Puppet. At that point, the VM doesn't matter. I tend to treat mine's as thro

That's why you manage the VMs with a configuration convergence tool such as Chef or Puppet. At that point, the VM doesn't matter. I tend to treat mine's as throw-aways, and have Chef rebuild the specific VM for the specific project. This lets me experiment with things and then reset it back to a known, good state.