ensure that the global/job configuration is backed up

* https://thepracticalsysadmin.com/backing-up-jenkins-configurations-to-s3/
* https://plugins.jenkins.io/scm-sync-configuration
* https://plugins.jenkins.io/periodicbackup

Start by reviewing the three linked references on Jenkins configuration backups, then inspect this repository's Terraform and Ansible deployment configuration. The issue does not name files, tests, a backup destination, or a verification procedure; completion would require defining those details and ensuring the global and job configuration is backed up.

Written by the indexing model from the issue text.