If you still have autosave.xla from a previous version of excel, it'll work with
xl2003.

Jan Karel Pieterse wrote an addin (works in any version) called AutoSafe (note
spelling).

It doesn't overwrite the existing workbook when it saves. It saves to a user
selectable folder. And when it's done, it either deletes these backups (or puts
them in the recycle bin). And the user can always restore the backups from the
recycle bin.

http://www.jkp-ads.com/Download.htm
(look for AutoSafe.zip, not autosafeVBE.zip, for your purposes.)

LeProf wrote:

I need to have Excel 2003 save a changing file automatically and
periodically. This was available as an add-in in earlier versions. This
capability is fundamental to unattended (lab) data collection. What to do?

--

Dave Peterson