Trick question? My guess is you are trusting FTM to keep private info .... private? Get a utility that tracks your internet usage by application. Some versions of MacAfee do that (e.g. the ATT branded version). I was stunned at the volume of uploading that is going on constantly in the background apparently. And, I do not upload my main tree, only a small tree that I rarely use for research. For my main tree, with 14k people, I am looking at 2 GB/month uploading from FTM. My only purposeful uploads are search requests, which seem to me like search requests are sending a few hundred bytes each.