

Audit trail
Audit Trail is a plugin to keep track of what is going on inside your blog. It does this by recording certain actions (such as who logged in and when) and storing this information in the form of a log. Not only that but it records the full contents of posts (and pages) and allows you to restore a post to a previous version at any time.
To summarise:
Audit Trail is available in:
Full documentation can be found on the Audit Trail Page page.