For the creating part, it will use the upload bandwidth for Homestead, and the download bandwidth for Happy9.
For the saving part, where are you saving it? If you're saving it in Happy9, then no bandwidth is used. If you're saving in Homestead, then the download bandwidth for Homestead, and the upload bandwidth for Happy9 will be used.
Remember, network transfers involve 2 parts: one sender and one received. The sender will use its upload bandwidth, and the receiver will use its download bandwidth.
Diego