I have my home computer lab setup to run ESXi with several VMs and I have been slowly upgrading it, with the occasional bit of spare cash. I am by no means a virtualization expert, I am just dabbling into the world of virtualization and I am loving it. I've been using ESXi for over a year, in my old employment and at my home computer lab. I have used pretty much every free backup program there is. Backing up ESXi is a pain, due to VMware being a bit of an arse and restricting the APIs.