The "missing magic" I'd like to see is a script that knows I started with Debian, installed these packages, and derives the set up script to reproduce this serv

The "missing magic" I'd like to see is a script that knows I started with Debian, installed these packages, and derives the set up script to reproduce this server including my configuration changes. That way I can make the changes in an environment that works for me and have technology do the boring part.