I can’t add directly to @MSameer 's response other than to say it is a quick and straightforward procedure which causes me unnecessary stress every time I have to do it!
Once you have done it a couple of times, it becomes almost second nature - just make sure you have an up-to-date config at all times. There is a brilliant script called multi-report which, amongst other things, creates automatic configs and sends them to you by email which you can set to run periodically (e.g. once a week).
I spent some time looking into making a second “spare” boot disk which I could keep safe in a drawer somewhere, but in the end I decided that the re-installation process is straightforward enough for me not to bother.