auto save of docs?

Hi, just a quick question, ist there a way to make files auto save after xminutes? Like when I am editing something in text editor, can I do something to have the file saved every few minutes? Cause sometimes it happens that I edit some file and I am really into it, and forget the time. And then I hit save, but in the meantime I have been logged out. And all edits gone.

Or maybe a way to disable auto log out?

Or maybe a warning splash that I am about to be logged out?

whatever is easiest to implement

maybe I can do it myself if pointed in the right direction