Exporting and then importing WordPress content

NB!!!
The official WordPress Importer found through the tools section does not correctly add media. It gives an error message and adds links to media that are located in the exported site. A new project is underway that starts from fresh. I will share more information when it is available.

I would suggest instead use one of the many backup/clone plugins available.
My choice of clone/backup site plugin is Duplicator: See my Duplicator video tutorial.

Or perhaps check out: http://www.wpallimport.com

There are a few plugins to export and import WordPress content. The official one is the
WordPress Importer plugin which imports posts, pages, comments, custom fields, categories, tags and more from a WordPress export file.

How well does it work?

Export
First one has to export from a site. The default export will contain All content or Posts or Pages. It will not export users so before importing be sure to add the needed users.

Import
Posts, comments, pages and media attachments were copied over from the old site in an xml file to the new site. Everything looked to be in place.
NB!

Other plugin options:
https://wordpress.org/plugins/wp-advanced-importer/
https://wordpress.org/plugins/widget-importer-exporter/
https://wordpress.org/plugins/widget-settings-importexport/
https://wordpress.org/plugins/options-importer/

The WordPress Importer is being redeveloped:
https://make.wordpress.org/core/2015/11/18/wordpress-importer-redux/
https://github.com/humanmade/WordPress-Importer

Export plugins:
https://wordpress.org/plugins/export-plus/
https://wordpress.org/plugins/wp-exporter/

Download your media library:
https://wordpress.org/plugins/downml/

Check out an earlier article with a video I did on the WordPress Importer plugin.

Now what about moving comments from posts to another post?
There are some specific plugins for this:
https://wordpress.org/plugins/tako-movable-comments

The plugin is real easy to use and works well.