Is there any files or folders that I should backup incase I get a HDD Crash? If so which ones are they?
Probably your scenes & custom content (addons & local stuff)
basically:
AddonPackages (your .var packaged stuff: clothing, hairstyles, morphs, plugins, textures, images, audio files, scenes, looks, presets, assets...)
Custom (same as above but your local stuff, not packaged)
Saves (your scenes, legacy looks, legacy presets, legacy poses, some plugin stuff...)
Keys (your VaM key)
If you are building packages, it doesn't hurt to also backup
AddonPackagesBuilder
also if you are using reshade get your .ini profile (
reshade-shaders folder as well)
Everything else is less important & easy to recreate, some settings and what not