daxitude

Create drafts of WordPress posts/pages/CPTs even after they’ve been published. And when you’re ready, merge the changes back into the original published post.
<h4>Features</h4>
<ul>
<li>Create multiple drafts of already published posts</li>
<li>Merge the changes back into the published post when you’re ready</li>
<li>Uses the published posts’s original post type, so metas, taxonomies, etc all are available in admin screens and can even be modified in the draft and merged back into the original post</li>
<li>Perform a post diff similar to WP’s default revision.php?action=diff with added ability to compare changes in post meta and taxonomies</li>
<li>See a notice when the original post has been updated ahead of a draft</li>
<li>Preview drafts in the post/page/CPT’s natural template</li>
<li>Since drafts all carry the same custom post status, they are organized in the admin’s edit.php with their own status filter (see screenshot-4)</li>
</ul>
This plugin requires javascript.
<h3>How Does it Work?</h3>
Go to a post’s edit screen and click on the “Save a Draft” button in the Drafts of Revisions postbox (make sure you’ve enabled the post type first). The post’s core data, taxonomies, and meta data are all copied into a new post – the draft – as a child of the original post. The draft has a custom post status; it will never show up in any queries for posts. You can create as many drafts as you like.
You can edit a draft’s post content, taxonomies, and meta data as you like and save progress with the native WP “Save Draft” button. You can also preview the draft and compare changes against the parent at any time (even comparing changes in taxonomies and meta data).
When you’re ready to update the parent post, click the Publish button from the draft’s edit page. All post data, taxonomies, and meta data are merged back into the parent post and the draft post is deleted.

Drafts of Post Revisions

Create drafts of WordPress posts/pages/CPTs even after they've been published

Blackbam

Create, manage and view snapshots of any post (or custom post type) whenever you want. Like user-managed revisions with a lot of useful functionality.
Features: 
* Create snapshots of any post type including all metadata at any point manually as a secure history and backup of your posts 
* Uses the standard WordPress posts table (like revisions) 
* Uses a custom post status (and therefore works for any post type) 
* Easy snapshot management meta box 
* Create Snapshots comfortably in the publish post box 
* Choose which post types you want to enable the snapshots feature for
PHP Developer API: 
 pos_create_snapshot_from($post_id): Creates a new snapshot for a given post ID 
 pos_delete_snapshot($snap_id): Delete a snapshot by its ID 
 pos_get_latest_snapshot($post_id): Returns the ID of the latest snapshot for a given post ID 
 pos_get_plainview_url($snap_id): Get the URL to the plain snapshot view
This Plugin is sponsored by ready2order GmbH, the company which is producing Austria’s best point-of-sale system. Visit us at https://www.ready2order.com/.
NOTE: The use of a custom post status in WordPress is still in beta. The developers of this plugin are in no possible case responsible for any data loss. 
If you want to be sure nothing happens, backup your database on a regular basis. You should do it anyway.

Post Snapshots

Everything works as expected and I did not hear any compaints yet.

On our live website it has been working great since two months now

Create, manage and view snapshots of any post (or custom post type) whenever you want. Like user-managed revisions with a lot of useful functionality.

Drafts of Post Revisions vs Post Snapshots