Remote media storage in S3 and copying site to backup location

I am thinking about turning on the option in ES to store my media in Amazon S3. However, I also use my Akeeba backups as a copy mechanism for the entire site into a subdomain that I use for testing new components, plugins, mods, etc. If the live site uses remote storage, then I copy the live site into the test site, then aren't BOTH sites now updating the same S3 bucket? I am worried about the danger of that. Any ideas on how to make the copying of a live site easier, without having to worry about the backup site changing "live" data in Amazon?