gitlab-ctl reconfigure takes no action for gitlab-ci backup parameters

I add the following parameters in /etc/gitlab/gitlab.rb, after I ran gitlab-ctl reconfigure, these parameters have no effects to "gitlab-ci-rake backup:create".
gitlab_ci['backup_path']
gitlab_ci['backup_upload_connection']
gitlab_ci['backup_upload_remote_directory']
I double checked /var/opt/gitlab/gitlab-ci/etc/applications.yml after I ran the reconfigure command, these values are not pushed over to applications.yml
According to https://gitlab.com/gitlab-org/gitlab-ci/blob/master/doc/raketasks/backup_restore.md , these variables should be supposed to work.