I make a good bit of my living with a computer and I know very little about them. My music production computers are never allowed on-line for any reason. I use thumb-drives or wifi to move data to another machine that is connected if I need to send or share files. Also, there are some of us that have login to a certain email account where messages are written and saved as drafts and never sent. This allows any of the logged-in to access the draft file, read the message and respond in kind while never sending anything over the net.