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When editing the content of a page, Wiki will automatically create a version of that page after it is saved. Thanks to the page versions, you can make changes on the page safely and roll back to an earlier version without worrying about messing things up.
In the Page History view, you can see all versions of a page.
Each version includes the following information:
Revision numbers.
Author making changes.
Date and time when changes are made.
Summary (if any).
All functions, including viewing, comparing and restoring, can also be done by clicking the Revisions link at the Page Info bar. One pop-up pane appears right under this bar, allowing you to do the same steps as described below.