You run into a problem where the model needs to be exactly the same on both ends. If your model is a couple of MB then updating it on occasion is no problem, b

You run into a problem where the model needs to be exactly the same on both ends. If your model is a couple of MB then updating it on occasion is no problem, but if it's several GB then you DO have a problem. Then if you want to decompress something that was archived 10 years ago you need to make sure you can find and install the old compression model.