It is my third time installing Ubuntu 16.04 on Linux because what I am trying to do is create a webserver for internet and intranet users, and because I am new, messing around with settings opens up a can of worms for me, and I have to reinstall everything. Although fun and I am learning, it is time consuming. I don't want to do that all the time.
So my question is about cloning. What is it? If it is what I think it is, which is to copy exactly the same state as a hardrive or a partition, restore to a good copy then where do I start? Any good software to help? What problems will I encounter?