reinstall after the newest update if so what's best?

[Blitzen]

The newest updates have played merry hell with my FPS cutting it nearly in half while using a SteamVR start.I wonder if a Steam uninstall & reinstall is called for? I've done this before using Steam , but once lost nearly everything extra ( skins, missions campaigns ,Mods etc.)when I last did it ( luckily I had saved a copy of the entire Box game elsewhere..) so I'm a little gun shy to do it again.Is there a proper order and/or saving copies of folders I should do before clicking "Uninstall & Reinstall ' in Steam? thansk!