Gregory's Server
The Sidosi webmaster died(rip Dan Parson) this summer and 3 months later the site finally goes dark and the community is still scrambling to collect all the pieces from the wayback machine. Most of the javascript tools and APIs are broken now, and nobody has a copy of the site.
Don't be that community, backup your shit, have a contingency plan.
@neauoire it's macabre but definitely good to have a bus factor of more than one wherever possible. @eigenbom was talking about how that might apply to godot actually