Takashi Fujisaki

Tiny Backup is a WordPress plugin that allows you to create backup files simply and without any complicated configuration. 
You can create and download the bare minimum backup with just one click, stress-free.
<ul>
<li>Database backup (SQL inside ZIP)</li>
<li>Files backup (select folders under <code>wp-content</code>)</li>
<li>Clear progress indicator and logs</li>
<li>No external services; everything runs on your server</li>
</ul>
This plugin is ideal for small to medium sites that need quick on-demand backups.

Tiny Backup

Simple and minimal backup plugin for WordPress. Create database and files backups with one click.

George Stephanis

Most themes are licensed under the GPL, which makes it completely legal for you to do whatever you like with them, so long as you don’t restrict what other people, in turn, can do with them. This is a type of copyleft license, and it means that you are free to redistribute any GPL-compliant themes any way you like!
Unfortunately, it’s often hard to actually do. While it’s easy to upload a theme as a zip file, it’s difficult to get the theme back afterwards! This plugin aims to make that a bit easier.
If your server is capable of making Zip archives, and your user account has the <code>edit_themes</code> capability, then this plugin will let you download any of your themes — including any modifications you’ve made to the code of it — as a Zip file that you can then reinstall on any other WordPress site!
Enjoy! 🙂
P.S. — If the author of your theme didn’t license it on a GPL-compliant license, make sure you’re not breaking any licensing terms by what you do with the theme once you’ve downloaded it!

Theme Downloader

A handy dandy plugin that tries to let you download any installed theme as a zip file.

Tiny Backup vs Theme Downloader