Not a Luddite; I just see issues...
I have a DropBox account (Razer Game Booster encouraged it), but I wouldn't put a single really really important document there. Hackers and disgruntled employees (ex or not) make me think there's no such thing as security. The Standard of Conduct seems to be for somebody to resign once a major data breach happens, but not for those breaches to be made impossible because that might not be profitable. Not a thrill, so a new vendor like Amazon isn't going to matter to me...