I'm starting a new server and I need to know which folders to copy in order to fully backup the server (aside from everything that can just be re-installed). I searched, but a lot of the information is outdated. Is the 'server/<server identity>' folder all I need now? Does that contain all world and player data (bases, inventories, player location, blueprints, painted signs, etc.)?

Other than the Oxide config files, is there anything outside of this folder that I might need? What is in the 'userdata' folder in the root, and should I back that up as well?

For my backup, I save the oxide folder as well as the folder containing .map files, player blueprints and the cfg subfolder.  If you're using lgsm or some other third-party management tool, there may be other folders such as lgsm/config-lgsm/rustserver/.