Problem With ESXi: There are lot of people who use VMWare ESXi for virtualization. But most of them manage through Vsphere and have multiple servers VSAN clusters. The vsphere license is not free. The main limitation i faced with free version of ESXi, is that there is no proper backup solution. I had to shutdown VMs and copy manually to NAS. I tried some solutions found in reddit communities and third party software, none of which served my purpose properly.