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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Backing up abbrev_defs?
Date: Fri, 02 Aug 2019 12:13:01 +0300
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> From: Sharon Kimble <boudiccas@skimble.plus.com>
> Cc: help-gnu-emacs@gnu.org
> Date: Tue, 30 Jul 2019 22:07:07 +0100
> 
> >> No! No backup created from it at all! Which I found was rather strange, hence my request.
> >
> > What command(s) did you invoke to save your abbrevs?
> 
> C-c C-c

I suggest to submit a bug report using "M-x report-emacs-bug".  I
clearly see on my machine a backup file for abbrev_defs, but upon
reviewing the code in abbrevs.el I don't think that backup file was
created by Emacs.  So this sounds like a missing feature.

Meanwhile, you could work around by editing the abbrev_defs file
directly, as opposed to saving it with C-c C-c.