Mindvalley

Have a crap ton of sidebars and widgets setup?
Losing sleep because you’re afraid to lose all those settings if someone messed with it?
Look no further. Use this widget to
<ol>
<li>Take snapshots of your current widget settings.</li>
<li>Restore previous snapshots.</li>
<li>Import / Export snapshots as XML.</li>
</ol>

MindValley Widget Snapshot

Takes snapshots , enable import and export widget settings & configurations.

webshrinker

This plugin will allow you to automatically show previews of external websites when a user hovers over a link in your posts. 
It’s designed to work “out-of-the-box” and no changes should be needed on your part to make it work. 
However, if you are familiar with CSS, you can apply “link previews” to links in other places in WordPress site by specifying any CSS selector that you want.
A free or paid <a href="https://www.webshrinker.com" rel="nofollow ugc">Web Shrinker</a> account is required as you will need a service API key.
<iframe class="youtube-player" width="640" height="360" src="https://www.youtube.com/embed/1xGf00XQSH8?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation"></iframe>

Web Shrinker – Website Link Preview Thumbnails

Enhance your post links by enabling a popup preview thumbnail image of the destination website

MindValley Widget Snapshot vs Web Shrinker – Website Link Preview Thumbnails