When a file is hosted in the cloud (that is, OneDrive, OneDrive for Business, or SharePoint Online), AutoSave enables the user's edits to be saved automatically and continuously. Under file, options, save.in the same location. Word 2016 doesn't have a true autosave function, as in save file every x minutes (I can see some negatives to this anyways) but it does save files you didn't save before closing if you tell it to. I am trying to make word 2016 my default application for text files.
Learn about how AutoSave works in Excel, PowerPoint, and Word, and how it can impact add-ins or macros.