Subject: bug#47700: Backup options vs. file extensions

From: 積丹尼 Dan Jacobson <[email-masked]>
Date: Fri, 09 Apr 2021 19:57:14 +0800

(info "(coreutils) Backup options") is great, except,
it needs examples of how one can preserve file extension with it.

E.g., x.jpg~ messes up plenty of viewers, but x~.jpg is fine.
Same with numbered backups.

So the page should discuss this problem, and mention workarounds.