This is a very simple one-step archiver for Layout. Run it on any scene. The loaded scene will remain the same, and a copy will be saved to the loaded scene's folder. Copies are named with a "0.0001" increment, so if you run IncArchLay on "howdy.lws" two times, "howdy_0.0001.lws" and "howdy_0.0002.lws" will be save to disk.
Continuing the above example, if "howdy_0.0003.lws" already exists and you run IncArchLay a third time, "howdy_0.0004.lws" will be created.
This is a simple script, so feel free to adapt it to your own liking. If you can get this to work with modeler, let me know...
I take no responsibility for any grief these Lscripts may cause you and make no warranty regarding their effectiveness.