To backup and restore rF2 onto a new steam library or new steam install on a new OS, this is what you need: \steamapps\common\rFactor 2 which includes \UserData which contains all your settings and car setups. \steamapps\workshop\appworkshop_365960.acf tells steam what workshop content you subscribed to. \steamapps\workshop\content\365960 contains the subscribed workshop content. \steamapps\appmanifest_365960.acf lets steam know the rFactor 2 folder is in the library, so it shows up as "installed". (requires steam restart) Once I figured this out, absolutely zero manual setup was required after the fact, even though I copied the game from Win7 to a new steam install and new library folder location on Win10. Everything is the same as my old install. What a great time saver. There is no need to "install" the game if you've made a backup of all of the above. Upon first run the game should automatically install any required Visual C redistributable packages, but they're in the \support\runtimes folder if you need them. There is nothing in C:\Users\Yourname for rF2 and you can completely ignore \steam\userdata\* as well because the userdata are in \common\rFactor 2\userdata. I had to figure it out myself as this info wasn't easy to quickly find, so I created this post to make the information available for the next person to find. This guide is on Steam too in slightly longer form: https://steamcommunity.com/sharedfiles/filedetails/?id=2612086173 so you can use that if you want to send me fun yet pointless awards or add it to favorites so you can find it again in the future.
interesting note from steam: Non-workshop mod cars and tracks are in: \steamapps\common\rFactor 2\Installed\, so that's the directory you would have to sync, in addition to appworkshop_365960.acf and \steamapps\workshop\content\365960.
