Save Server State?

My friends and I do a lot of Spacebuild, and we like to put LS on all the maps we screw with. Is there a way we could build up our stuff, save, then keep going? So if the server crashes, or if I have to shut it down I can have it backed up? I know linking things with Adv Dupe would work, but that takes a lot of time, and I always miss something.