From what I can gather, BigStash is a rebrand of Deepfreeze.io, which itself is a sideproject of Longaccess.com, launched in 2013.

Not sure why, but the old saying 'if it's too good to be true, it probably is' keeps going around my head.

5tb would cost you what, £170 to purchase? (Brief Google search, feel free to correct me). Multiply that by the amount of customers that will sign up for this and it seems a little bit of a loss maker to me.

Note this is all just conjecture on my part, and I could be completely wrong.