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.

Aaron Jorbin

A workaround for users who are dealing with improperly created zip files.

Force PclZip

Force the use of PclZip instead of ZipArchive

Tiny Backup vs Force PclZip