And now on your last "day n hour n" you have 10 single versions with nothing else to show. Whereas the git users who've internalized the modern incarnation of the advice instead ("Branch early, branch often; commit early, commit often") would have 10 different interrelated branches with all of the steps showing (e.g.) excatly how foo-05-subroutines.pl was diverged and then mutated into foo-08-tests.pl then subsequently inspired foo-10-modules.pl. And they still have all that info and history behind the curtains after they merge and rewrite things down into the final form they present for whatever public consumption.

If you use it right it's not an either / or between "multiple historical backups" and "SCM", it's more "por que no los dos" (but git does the "dos" mucho mejor than dumb files).