AutoSave is a new feature available in Excel, Word, and PowerPoint for Microsoft 365 subscribers that saves your file automatically, every few seconds, as you work.

AutoSave is enabled by default in Microsoft 365 when a file is stored on OneDrive, OneDrive for Business, or SharePoint Online.

Here's a common practice: You open an existing document in Microsoft Word, Excel or PowerPoint, make some changes to it, then save it using a different filename. That leaves the original alone, but gives you a modified copy.

Just one problem: Microsoft's Office 365 no longer works that way. Because of an incomprehensible change pushed out not long ago, any changes you make are automatically saved -- meaning your original document is overwritten, even if you don't want it to be.

What's more, when working on a document that's already been saved at least once, you'll notice that the "Save As" option -- as old as the software itself -- has disappeared from the File menu.