4 months ago - Red Eagle LXIX - Direct link
The game already double-saves the main config, player, vehicle, drone, and power information. You can see this yourself from looking at the save folders.
Notice the following files:
drones.dat + drones.dat.bak
main.ttw+main.ttw.bak
power.dat+power.dat.bak
vehicles.dat+vehicles.dat.bak
player/.ttp+player/.ttp.bak

Often after a crash if one of those files is damaged it will revert to the backup (that is why sometimes after a crash you might be a few steps or someplace a bit before where you were when the crash occurred.

A crash during writing can cause the damage to files not just the one being written and since these are rather small files that is possible.

There is nothing preventing the user from making additional backups to a location that is not being constantly written during game progress. I often do this myself (especially for my perma-death saves). It has prevented a loss due to crash on a few occasions.