I have a save game exploit, but unfortunately it's a manual process. Open the save files and duplicate the folder on a regular basis. This way you shouldn't lose more than a days worth of progress should the unfortunate happen.
On Windows this is something like: C:\Users\YOURNAME\AppData\Local\Hinterland and then make a copy of the "TheLongDark" folder. I just keep duplicating the folder any time I need to back up, so I have multiple copies at any point in time.
I learned the hard way that not having backups can cause you to lose your entire game progress all due to a bug not your own fault. I got trapped in multiple locations unable to move. I now backup after any major in game achievement or right after I quit for the day. It sucks that you have to do it manually, but for now I have not been annoyed enough to create an automated system.