When a wiki page is updated, the previous version is kept in the wiki page history.

Select a project and click on the Wiki tab. Click on the list icon and choose "Versions" or click on a wiki page and you will find on the top right a "Versions" icon.

1 To view a version, click on the magnifier icon or on the version number in the "Version" column. To restore an old version, click on the pencil icon.

2 You can as well navigate with these shortcuts.