TYPO3 can be used as a collaboration tool. The History/Undo and Versioning facilitate a cooperative editing environment.
While working in groups on a page, it may be useful to see the changes made by another contributor. Page change history is kept for at least 30 days. History older than 30 days is not guaranteed to be available.
The Versioning module shows a summary of all changes to a page from the current published version, known as the Live version.
A screen capture of the Versioning module shows the text added in green. Deleted text would be shown in red.
The screen capture also shows the current status of the content (Editing, Review or Publish states).
Before a change is published, it is very easy to cancel changes using Remove from workspace.
After canceling the change, the element will be reverted to the live version. This means if the page or content element was never published, it will be thrown away (unrecoverable). If it was previously published, the changes will be thrown away (unrecoverable) and visitors will still see the unedited live version.
To undo specific changes to a page or page content,
Read more about history/undo at TYPO3.org -> http://typo3.org/documentation/tips-tricks/the-undohistory-feature/