What is Auto-Save?
Auto-Save is a new feature for documents saved to OneDrive. Auto-Save means that your work will be backed up all the time and that you don’t need to manually save it. Before starting work save the document to OneDrive and check that the Auto-Save switch is on. The switch can be found in the very top left corner of most Office 365 products. If Auto-Save is on the icon will look like this.
By using Auto-Save you are much less likely to lose work because of a crash.