When posting please
use your full name (first and last) even and be darn sure that
you are not using a legitimate domain name for a fake one.
use a subject that identifies the problem.
The answer to your question can be dependent on your version
of Excel and your updates, but select
Tools, Autosave
then on the dialog 15 minutes, and your other choices as wanted.
Autosave is an addin if not on the menu use tools, addins
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