Where I work, the fax was a way to ensure that information could be sent in multiple ways, if one way would fail. In the medical field (at least where I live) we must have systems with backup systems in a few layers. We have a nice digital medical chart system, and I still have to print out many things and put in a binder that no one ever reads. Because the internet could stop working, or electricity could fail. We even have routines for which types of pen and paper can be used if we need to write things by hand while electricity is gone.