There has been no Autosave in Excel since version 2000.
There is Autorecovery feature which saves a temporary backup copy of the
workbook at intervals while you are working on it.
If Excel crashes, the temporary file will be presented to you upon re-start
asking if you want to recover it.
If Excel does not crash and you close the workbook without incident, the
temporary file is deleted.
If you had "always create a backup" enabled you will have a backup of the
prior saved version available.
Gord Dibben MS Excel MVP