incremental save is a must full stop. Even if you save all the time.

It has saved my ass soooooo many times.

incremental save moves the last save file into a folder and replaces the file your working on - so the main file is always up to date. It can also be limited so it starts replaceing really old files so not to fill your hard drive up if 100`s of scene files.

As for auto save...
What version of Maya do you have as I know of a set of tools which is free that just happens to have a auto saver in it were you can also set the time of it (every 10mins, 20 mins, ect) but the tools only go up to Maya 8.5

link here anyway.

https://www.koshigaya.de/?content=download