In the past my organisation has had some problems where a development copy of a site was cloned (through Installatron in cPanel) to a new hosting account, but the new (live) copy of the site had some absolute references to images or files on the development copy of the site.
This meant that when the development site was taken down, some things broke on the live site.
How can I make the development copy of the site offline, including images and other files, so that any absolute URLs referencing it from the live site don't work? This way when we do our go-live review of the live site, we'll see any problems before the development copy is removed. I don't want to delete the development copy of the site just yet.
A method that can be used through the front end of the site (WP admin or cPanel) would be preferable so that non-technical staff can do it too.