I made incorrect changes to an Excel file and saved it, and MS Excel (2003) makes no backup files like MS Word does (only autorecovery files, but that is of no use after clicking 'save').
Is there a tool/utility/macro that will create a backup of the current Excel sheet every time I click 'Save'?
(The usual 'one previous version' method is good enough)
Free would be nice, I'm running Windows (7).