I highly recommend installing etckeeper. It puts all of /etc under
revision control. I use CentOS which is based on yum/dnf/rpm and it will
perform an auto-commit of changed files before updating. I disable that
feature so that yum won't update until I manually commit any outstanding
configuration changes, to make sure they get a proper change comment.
etckeeper uses git by default but you can use another revision control
system if you prefer. A minimal knowledge of git is handy for doing
manual commits and inspecting your change history.
Your distribution should include an etckeeper package.
https://www.tecmint.com/manage-etc-with-version-control-using-etckeeper/
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