The easiest way would be to copy your game folder + 1csoft club folder from "documents" to a drive you don't format, or to a USB stick.
I'm not sure how steam backup works. You can certainly get back the last official version, but not older versions.
__________________
----------------------------------------
Asus Sabertooth Z77
i7 3770k@4.3GHz+ Noctua NH D14 cooler
EVGA GTX 780 Superclocked+ACX cooler.
8GB G.Skill ripjaws DDR3-1600
Crucial M4 128GB SSD+Crucial M4 256GB SSD
Seagate 750GB HDD
CH Fighterstick+CH Pro pedals+Saitek X45
Win7 64bit
|