How many of you is this affecting? I'd be curious to know how many keep the only copy of their file on dropbox, or any cloud service for that matter. I've never trusted any service enough to be solely responsibly for my important files.
I use Dropbox primarily as a tool to synch content between my desktop/laptop/phone, but any significant change I make to those files gets saved locally 100% of the time.
I am not a very trusting man.