Umbraco does not save any of your web pages or content work automatically. If you navigate away from the page without clicking the “Save” or “Save and Publish” button at the bottom of the editing section, all of your work will be lost.
If you do accidentally navigate away from a page without saving, you should get a prompt asking you to Discard Changes or Stay.
Save will save the current state of your page and content to Umbraco but will not publish the content to the live website. This function is great if you are working on a page, but have to navigate away from the page and do not want to lose your work.
Preview allows you to preview your saved content and what it will look like on the live website. However, previewing the page will not publish the page to the live website. NOTE: You must save your page first before you can preview it.
Publish will post your new page onto the live website.