Not too sure if you stating that 1.5Tb's is enough or too much, but for the sake of consistensty and other people who are interested;1.5TB is not sufficient for a home user? WTF?
Streaming 1080p from Funimation, HiDive, Netflix, Hulu or Crunchyroll and that's easily going to be about 700Mb-1.3Gb for 20 minutes of video.
Download and update games on Steam, Uplay, Origin, EGS, GOG Galaxy etc, and you'll hit 500GB's or more pretty quickly.
Watch/Live stream on Twitch or Mixer for a couple of hours and you'll also be using up a lot of bandwidth.
1.5Tb's might seem like a lot of data but on a 100Mbps line you'll be surprised at how quickly things add up.