rsync - Nov 2020 - Bug when using rsync -r --delete -b --backup-dir

Consider following directory structure:
>  mkdir -p src/empty tgt bkp
when making an initial backup with
>  rsync -r src/ tgt
then the empty directory in src will be copied to tgt. However, if the
directory is removed from src
>  rmdir src/empty
and rsync is run like
>  rsync -r --delete -b --backup-dir=../bkp src/ tgt/
then the empty directory does end up in bkp. I am using the --backup-dir
and the --delete option to move an outdated snapshot to another directory
by backing up an empty directory. I was expecting that the entire
directory structure to be preserved. Apparently this is not the case
for empty directories.

Can this be fixed? Is this even the right place to file a bug report? I
do not have a github account to do this on github.

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On Mon, Nov 23, 2020 at 1:33 PM CRTS via rsync <rsync at lists.samba.org>
wrote:
> then the empty directory does end up in bkp.
>
You mean "does not".  That is correct, as it only creates backup dirs
to
hold backup files. I recall this being specifically chosen as the desired
outcome but not the details of why (since it was many years ago). In
any case, it's unlikely to change.

..wayne..
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