I have been running a Microsoft AutoUpdate (MAU) Caching Server for a couple years now and have always allowed it to download and serve everything, even applications we don’t use. My thinking was that I’d rather have something and not need it, than need it and not have it.
This has never been an issue for older products like Office 2011 and Lync (or even current products like Company Portal and Skype for Business) because combined they are only around 500 MB. The fact that Office 2011 and Lync are no longer receiving updates means the bits on disk haven’t changed in over a year and don’t need to be downloaded with each run of MAUCacheAdmin.
However things changed with the release of Office 2019 last fall. While Office 2011 is no longer being maintained, Office 2016 will continue receiving security updates until October 2020. If you have already transitioned to Office 2019 this means that MAUCacheAdmin will continue to download almost 6 GB of installers and updaters every month that you don’t need.
Thankfully it is easy to customize this behavior so read on if you’d like the details.