We are a small company working on our first Revit project. Usually (using AutoCAD) when issuing drawings we, like most, save a copy of the DWG file and bind all xrefs so that we have a 'snapshot' of that particular drawing issue should we need to revert to if for some reason. I'm sure this must have been asked before but how do you achieve this with Revit? As far as I can see we will need to make a copy of the whole Revit model every time we issue a drawing! How do you guys do it?