The first part of the question is really good question indeed. Not sure on how it can be done; but will require a little bit of thinking and help from support.
For the 2nd question, it is well documented in the install guides. But, to answer your question - you take a backup of the configuration data of the deploy machine and save it somewhere. If you have to replace it with a new one; just install a new one and import the configuration data into it, and it will be good to manage the cluster.