I do have a SaveGame, I can load this, can duplicate it, can copy it. It is a persisted world, which is basically a save game. A DB backup is basically a SaveGame IMHO.
There is no technical reason why this is not integrated into the single-player mode of the game. I also think this could be integrated into a mod.
Unless the reasoning is: This is a multi-player game and we do not want to put any effort into the rudimentary single-player part.
It is not something I myself want, actually. But I keep getting questions regarding this in my stream from chatters (dKrisch TTV).