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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Reviewing versioned backups
Date: Tue, 23 Mar 2021 11:44:51 +0200
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In-Reply-To: <YFm1XhDeY5mdCnRZ@protected.localdomain> (message from Jean Louis
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> Date: Tue, 23 Mar 2021 12:31:10 +0300
> From: Jean Louis <bugs@gnu.support>
> Cc: help-gnu-emacs@gnu.org
> 
> * Eric S Fraga <e.fraga@ucl.ac.uk> [2021-03-23 11:39]:
> > On Monday, 22 Mar 2021 at 23:25, Jean Louis wrote:
> > > I am using RCS and to review some previous version I do: `C-x v ~
> > > VERSION-NUMBER` then I get full file visible in the buffer.
> > 
> > I think the OP is using the simple backup file method built-in to Emacs,
> > not a version control system, i.e. that files are backed up using a
> > simple numbering scheme.
> 
> How do you do that?
> 
> My variable `make-backup-file' is T. But that I think does only a copy
> with ~ on the end.
> 
> How do you enable backup files with simple numbering scheme from
> default? 

It's in the manual: see the node "Backup Names".