Foreversave works for me
I use it on Office for Mac, as both Word and Powerpoint sometimes crash so badly that the autorecover fails to save anything; and for Freeway Pro, which has no undo option🙁
I set it to back up EVERY MINUTE in Freeway Pro, so I can always backtrack when I can't undo.
The config documentation is a bit confusing, but once you get it working, it increases your confidence significantly