Does minecraft use upload or download data?

My internet has been going through the roof lately and I was wondering if it could be minecraft. It is mostly the download data that is being used, the upload is barley being touched. I played for about 2 hours, and I watched 40mins of netflix and I look and see that my internet is already at 4.8gb. Other people in my family use the internet but just for browsing and the occasional video.