The document discusses upgrading WooCommerce to address a security vulnerability. It recommends updating to version 2.3.6 immediately after an SQL injection vulnerability was discovered on March 13, 2015. It provides instructions for both automatic and manual upgrades, noting automatic upgrades can be done by clicking "Upgrade Automatically" from the plugin page within WordPress admin. For manual upgrades, the latest version should be downloaded and uploaded to overwrite old files. After any upgrade, permalinks should be saved.

1. Upgrading WooCommerce
A security vulnerability was found in the WooCommerce plugin. I suggest you update to 2.3.6
immediately.
After an SQL injection vulnerability was discovered March 13, 2015 by WordFence, the WooThemes
team immediately put out a patch with a security fix.
The best way to protect your site is by updating the plugin to the latest version (v.2.3.6).
To upgrade a WooCommerce installation you can choose to upgrade WooCommerce automatically or
manually.
Automatic Upgrade
After you backup your site go to Plugins > Installed Plugins within WordPress to view a list of plugins
you’ve previously installed. If an upgrade to WooCommerce is available you will see a notice beneath
the plugin listing which states the point release which is now available as well as links to view the details
of that version and to upgrade automatically.
To upgrade simply click the ‘Upgrade Automatically’ link. You may be asked for your webservers FTP
details, if that’s the case fill them in to complete the upgrade.
Manual Upgrade
To manually upgrade WooCommerce: First, backup your site then download the latest version of the
plugin from our WordPress plugin page and uploade it to the wp‐content/plugins directory on your web
server overwriting the old files.
http://docs.woothemes.com/document/upgrade‐instructions/
Important: After updating your plugin go to: Setting > Permalinks after updating and Save changes.
WordPress Backups
Read the Codex to learn how to backup or WordPress site.
http://codex.wordpress.org/WordPress_Backups
Install BackupBuddy Optional
If you would like to install a premium plugin service, I suggest you try BackupBuddy.
https://ithemes.com/purchase/backupbuddy/