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From: "Pascal J. Bourguignon" <pjb@informatimago.com>
Newsgroups: gmane.emacs.help
Subject: Re: numbered backups
Date: Wed, 21 May 2014 04:37:02 +0200
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Steven Arntson <steven@stevenarntson.com> writes:

> I know I read how to do this somewhere, but can't find it now. I'd like
> emacs to name my backup files not as
>
> file.org.~1~
> file.org.~2~
>
> but rather as
>
> file.org.~001~
> file.org.~002~
>
> is there a variable I could call up from M-x customize to influence this
> behavior?

See the variable make-backup-file-name-function 
and the function make-backup-file-name

-- 
__Pascal Bourguignon__
http://www.informatimago.com/
"Le mercure monte ?  C'est le moment d'acheter !"