Install the content_import addon. I don't recall if this creates an app, but look in apps available to see if it did and install it if you find it. Then visit /content_import on your site and fill in the form and submit. The default is to import all posts and files and will catch anything that wasn't imported already. I seem to recall an option to ignore anything imported already. If you do this it will finish much faster, but if you just use the defaults it won't hurt. You can run it as many times as needed or desired. This is important if one of the clones is on shared hosting because it might whitescreen and take a few attempts to get everything. Once it has everything it won't whitescreen.