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.

dugubenyu

Page2Images Plugin allows user to create a website thumbnail preview in the content of posts using a tag [p2i]http://www.yourwebsite.com[/p2i] format. It can save a lot of time to take the screenshot of one page and parse it in the wordpress.
The plugin requires a free or paid account from <a href="http://www.page2images.com" rel="nofollow ugc">Page2Images</a> who is the service provider. No purchase is required to use the plugin or the free service.
Core features:
<ul>
<li>Insert URL and get thumbnail preview in one second</li>
<li>Customize the size of the preview easily</li>
<li>Support different preview device included iOS phone, Android phone and tablet.</li>
</ul>
If you need know more information, here is our website thumbnail <a href="http://www.page2images.com/website_thumbnail_api_document" rel="nofollow ugc">API document</a>.

Page2Images Website Thumbnail

Create a website thumbnail preview using the Page2Images API.

Post Snapshots vs Page2Images Website Thumbnail