With an Elastic Cloud Server you get a cloud server with is both scalable and flexible. You can increase your resources for your server as needs change, however unlike a Flexible Cloud Server you are only allowed to run a single instance or cloud server with those resources. A Flexible Cloud VM allows you to create a pool of resources and create as many as 8 VMs in one cloud. With this option, you can also set your server to auto-scale and use any extra resources you have in the event of a traffic spike. Both options are highly available and can be controlled through your customer control panel.