Updating gitlab-secrets.json

Self hosted EE here…Omnibus installation…
I am wanting to make sure that my secrets file is being updated correctly and backed up correctly. Im copying the whole /etc/gitlab/* to my backup location. In the past weeks my developers have started several pipelines and each have various secrets in the variables section of each pipeline. I looked at my backups and also in /etc/gitlab and the gitlab-secrets.json file has not been updated since the date that I started up this instance. Id think the file timestamp would be when the last secret variable was written to it right? I added a test var in one of my piplines and the file still did not update.

Should that file’s timestamp update when I add a new variable into a pipeline? How do I know that the file is current and my backups will work when I need to restore if the timestamp does not change?