avdude

This wordpress plugin allows you to create and download a backup of a plugin or your entire plugins directory. 
Very useful to use just before updating a plugin. 
Adds menu item to Plugins & Tools

Plugin Grabber

This wordpress plugin allows you to create and download a backup of a plugin or your entire plugins directory.

Kailey (trepmal)

Upload a zip archive and let WP unzip it and attach everything to a page/post (or not).
Please note that you’ll still be restricted by your server’s maximum upload size.
<ul>
<li><a href="http://twitter.com/trepmal" rel="nofollow ugc">I’m on twitter</a></li>
</ul>
If the zip file uploads, but the contents aren’t extracted, see the <a href="https://wordpress.org/extend/plugins/upload-media-by-zip/faq/" rel="ugc">FAQs</a>.
<h4>Languages</h4>
<ul>
<li>Farsi, by <a href="http://www.newbie.ir/1390/04/upload-media-by-zip/" rel="nofollow ugc">mohsengham</a></li>
<li>German, by <a href="http://deckerweb.de/" rel="nofollow ugc">daveshine</a></li>
</ul>

Upload Media by Zip

Upload a zip archive and let WP unzip it and attach everything to a page/post (or not).

Plugin Grabber vs Upload Media by Zip