Ok, I couldn't figure out any command to get dedicated saving working (though loading is easy, Badspot must have not made a command similar in name to it.)
What I'm going to do is leave the dedicated running with my client on the server working autosave, so lets see how that works. (I'm also interested in what the last save time will be, to see if the server is just restarting, or if my computer is turning off, doing something, then coming back)