I honestly wouldn't worry about it at all.
It list the cap at 250gb for the both of us.
It's WILDLY wrong. I use between 400-700gb a month. It records as little as 100gb some months, sometimes as high as 200gb. The last 3 months however it hasn't reset and is showing »i.imgur.com/bl5H2kk.png
(keep in mind this is for 3 months with no reset to zero) while my PC alone is at »i.imgur.com/aprfk2w.png
(this does not count local LAN traffic) for the month. This also doesn't include the wifes/kids/and the tv that streams atleast 3 hours a day in HD.
So no, I wouldn't worry about it at all. You might get a warning if you do a TB or two. But I can honestly tell you I go over the 350gb softcap monthly and they've never said a word.