How would you feel if they told you they were going to keep all your photographs, your documents, your address book, your financial data, your browsing history, your emails, your chat logs, your electronic diary, your music and recordings and anything else they liked for at least six years - indeed maybe they’d keep them until you reached the age of a hundred in case they might prove useful one day?
I don’t see the distinction between the border and everywhere else. However, I think the physicality of the border search makes for a good example of what a normal day of NSA dataveillance is like.