From what directory did you issue the command:
php automated_backups.php
For any of the moodle cli scripts to work one must be in the moodle code directory.
So ... **example** ... if moodle code was in /var/www/html/
cd /var/www/html/
php admin/cli/automated_backups.php
Reason ... the CLI scripts reads variables in config.php of Moodle.
** Read the Docs **:
https://docs.moodle.org/37/en/Course_backup
https://docs.moodle.org/37/en/Automated_course_backup
From your screen shot of where you storing backups, I'd say none of the course backups have completed successfully. Backup files in Moodle end with .mbz.
Example of a M34 version using autobackups to designated directory outside of apache:
/home/backup/m34/courses
[root@sos courses]# ls -l *2019*
-rw-rw-rw-. 1 root root 2768323 Feb 19 2019 backup-moodle2-course-2-sa-20190219-1555.mbz
-rw-rw-rw-. 1 root root 3871679 Feb 19 2019 backup-moodle2-course-3-test-20190219-1553.mbz
-rw-rw-rw-. 1 root root 23624714 Feb 19 2019 backup-moodle2-course-4-mshare-20190219-1554.mbz
-rw-rw-rw-. 1 root root 1217811 Feb 19 2019 backup-moodle2-course-5-slcentos-20190219-1554.mbz
-rw-rw-rw-. 1 root root 1260971342 Feb 19 2019 backup-moodle2-course-6-gte_complete-20190219-1554.mbz
Also, this warning ... 'PHP Warning: Module 'zip' already loaded in Unknown on line 0'
relates to php extensions ... php extensions need to be loaded only once. Above error indicates an issue with PHP extensions ... in particular, php-zip
As root user, issue php -m [ENTER]
You should see a long listing of php info ... and towards the bottom:
zip
zlib
[Zend Modules]
Zend OPcache
PHP on CentOS 7 loads extensions from ini files in /etc/php.d/
in that directory should be only **one** ini file for zip:
from /etc/php.d/ directory:
[root@sos php.d]# ls -l zip.*
should show only:
-rw-r--r--. 1 root root 47 Oct 26 05:50 zip.ini
and zip.ini should show:
; Enable zip extension module
extension=zip.so
enabling the zip extension.
Strongly suggest finding some tutorial on administering a CentOS 7 server. Google for that! 
'SoS', Ken
