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From: Alain Ketterlin <alain@dpt-info.u-strasbg.fr>
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Subject: Re: Making a backup file on every buffer save?
Date: Mon, 02 May 2011 16:32:10 +0200
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Roy Smith <roy@panix.com> writes:

> The docs say:
>
> "Emacs makes a backup for a file only the first time the file is
> saved from a buffer.  No matter how many times you subsequently save
> the file, its backup remains unchanged.  However, if you kill the
> buffer and then visit the file again, a new backup file will be made."
>
> Is there any way to override this and get a backup file on every
> buffer save?  I'm using GNU Emacs 23.1.1.

A few paragraphs later, the doc mentions that C-u C-u C-x C-s should do
what you want (but I guess auto-save is supposed to solve the kind of
problem you had). Or you can call make-backup explicitly.

-- Alain.