Howdy. While fooling with php-fpm/apache the past couple of days, I had to look at the WordPress Tool Kit because it requires php-fpm/daemon to run. It's a pretty handy too.l Besides making it easy to manage wordpress installation, it also has a 'smart update' function that can be turned on when updating:
Smart Update allows users to test the update of their website, its plugins, and its themes, without actually affecting the website. Smart Update creates a full clone of the website, runs a number of preliminary checks, updates the cloned website, and runs the checks again to see if the update has broken anything. The resulting data is made available to the website owner in the WordPress Toolkit UI, along with a number of before-and-after screenshots for additional visual comparison. The user can then make an educated decision about whether the update should be performed or not, and tell the system to either perform the update on the production website, or discard the update.