Auto Recover is a built-in feature available in Microsoft Office. The Auto Recover feature saves all copies of all Excel files at a user-definable fixed interval and can help you recover your files. Whenever there is a power failure, by default Auto Recover saves your files every 10 minutes. If there are unneeded files, the files will be deleted automatically due to the following situations: the file is saved with a new file name using Save As, the file is manually saved, you close the file, or you turn off Auto Recover for the current workbook.