You may save changes to the page without publishing them. That is useful when you need to break your work into several steps.
Login to SiteSupra Edit Site.
Open and edit a required page
After you have introduced changes click Apply button to make changes take effect.
Click Save Page button to save changes.
Now the changes you made to the page are stored on the server.
Cancel Edit button restores the page on the last
Save Page action. That means changes that have been applied to a page but not saved would be lost after clicking Cancel
Edit button. It also means that once Save Page is clicked it wouldn't be possible to return to the initial page status.
To avoid that situation you should create a new page version when contributing major changes. Read more on Page Versioning.