Whoever you want to backup your content, give them the following folder rights:
HTML Code:
r */*
r */*/*
r */*/*/*
r */*/*/*/*
r weapons/*
r npcs/*
r scripts/*
As far as I know, wildcards exclude the scripting folders for some reason. Not sure about that, please beat me if I'm wrong. Anyways, that will most likely give you access to every folder in the file browser. So just download everything, and there goes your backup.