Any way to dynamically create copies of worlds at runtime?

[dackage]

I've been trying to dynamically create copies of worlds at runtime kind of like Mineplex or pretty much any large server.

I know I could create a copy of the files and then rename the world name (folder). I would prefer to do it without copying data.

Even if I did either way I still have no idea how to add a new world at runtime.

PS: Is this the software that a lot of the big servers use? If not then which software?