A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Hi Jonathan,
The AutoSave is a new feature available for Office 365 subscribers wherein changes made on the file are saved in every few seconds. Regarding your concern, we cannot turn off the AutoSave feature by default in Excel 2016. However, we can turn this off to a file and Excel 2016 will keep it every time you reopen that file. To know more about the AutoSave feature and the FAQ's about it, feel free to check this link.
Let us know if you need further assistance.