How to save full map.

[chizzychizzy]

Hello gent's. Me and my friend(s) were playing on a SRCDS garrys mod map *gm_bigcity*, and we made a lot of things. I am running the server on my Windows 8 machine. I was wondering if there is a way I can save the entire map, inventions and all, and then add it to the server at a later date, inventions and all.
So in short, is there any way I can save the map with my inventions in SRCDS, garrys mod server?

I just don't want to have to start from scratch every time I start up the server.