Verified in Satellite 6.3.1.
-bash-4.2# mkdir backup
-bash-4.2# katello-backup backup
DEPRECATION WARNING: katello-backup is deprecated and will
be removed in the next Satellite release. It is being replaced by
satellite-backup. Redirecting to satellite-backup now.
Starting backup: 2018-03-26 19:15:37 +0200
Creating backup folder /tmp/backup/satellite-backup-20180326191537
Generating metadata ...
Backing up config files...
Done with backup: 2018-03-26 19:18:16 +0200
**** BACKUP Complete, contents can be found in: /tmp/backup/satellite-backup-20180326191537 ****
-bash-4.2# ll backup/
drwxrwx---. 2 root postgres 203 Mar 26 19:18 satellite-backup-20180326191537
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.