Making Duplicates

I have three WordPress sites that I want to keep exact. One is my live site one is a backup or rollover site and one I use for testing. I do have the software that will clone these, but I don’t want to constantly keep doing that as it is time consuming. The WordPress Import / Export can only do one type at a time or all which messes up the styling.

I currently use Syndicate Out that is helpful for post but not videos, images, or thumbnails. Are there any plugins or solutions that I could use to make and keep these sites in sync without reloading or switching to WordPress multisite?