I do regular software updates on my late 2010 Macbook Pro which is running Snow Leopard. When i am connected to the Apple site my machine sends data and receives data before it advises me of any new updates. What is the very small amount of data 4 to 8 mg which i receive before i get the screen with the full details of the new updates. This may be a silly question but i have very little tech knowledge so make sure i do regular time machine back ups and software updates. I am only using the standard applications which came with the mac along with i Work