gitlab backup instructions
https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/raketasks/backup_restore.md
gitlab_rails['backup_path'] = "/var/opt/gitlab/backups" ...
If cron job failed to run it wasn't noticed you may have to make another request for your gitlab certificate. Here's a one liner that should help ...
Effective as of gitlab 8.6.0+ /var/opt/gitlab/backups...
https://webnugget.de/setting-up-gitlab-with-free-ssl-certs-from-lets-encrypt-on-ubuntu-14-04/ ...
/var/opt/gitlab/nginx/etc/gitlab-http.conf...