An alternative to complete cloning (which gets out of date fast) would be to manage systems with ansible. You can script configurations, package installs, users, etc. And it also allows for hardware/architecture specifics when needed (e.g. drivers for the different platforms). You would then just install a base os and run your playbook. No need to store gigs of data and easier to update the base os to newer versions. You can also push out changes without needing to snapshot a new image and re-install it everywhere.