Version Control
Before we begin
If you restore a previous version without publishing your current edits, your current progress will not be saved as a version, it will be lost. To save your current progress, publish the page or article before restoring a previous version.
Every time you "publish" a page or article, we save the changes you've made to that page as a "version". It is possible to view a history of these versions by simply:
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Opening the settings for a page (or article). 
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Selecting Versions from the top right of the settings drawer.  
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From here, you're able to Preview previous versions of the page or article and even Restore them if need be. 