Which house would you live in?
I re-discovered a wonderful analogy from The Economist's ' Babbage ' column dating to 2011: Would you like to live in a gated community where you show your passport or driving licence to a security guard who then walks you to your home and lets you in through the front door? Or would you rather live in a gated community where you get to choose your own door lock and key; with the risk that you might lose your key and not be able to get in? The first is like Dropbox, and pretty much every cloud-based data storage service from major players like Microsoft, Apple, Google and more. And it's like your Facebook account and, probably, your photo storage site. And so on. Even before reading that last paragraph, most of us instinctively would choose the second option. But that's not what we do in practice! In reality, we know that there's normally a fall-back if we do in fact lose our key to the house: maybe we've left a window open, or the back door unlo...