I've had Mathematica crash on me a number of times, and have had to recreate notebook contents from the last save point.
I was looking for something in the preferences like an autosave frequency configuration parameter that I could use to automatically save all my notebook content at some regular frequency to minimize losses due to crashes.
NotebookSave, and a
NotebookAutoSave -> True attribute for
CreateDocument, but both these appear to be for manipulating external notebooks. Is there a way to do this systematically and by default?