nv Skin Saver is a production ready tool to save out skinning information in Maya. The nice thing is that the tool will keep any other deformer information like blendshapes and will work even after the vertex count has changed. It's very simple to use and will allow to safely store skinning information while you're working on your model. The Skin Snapshot feature allows you to try different skinning versions and quickly switch between them.
Demo video: https://www.youtube.com/watch?v=tC6TILNv2HU