Several terabytes per week is a huge overestimate. Right now I'm getting 12 Mbps download speed (sadly typical for US broadband). If I saturated the connection,

Several terabytes per week is a huge overestimate. Right now I'm getting 12 Mbps download speed (sadly typical for US broadband). If I saturated the connection, and if no one throttled me, I could download 900 gigabytes in a week. That would be some intense web surfing. My practical experience is that you need about 1.5 MB per URL for storing large numbers of web pages, if you exclude video.