You misunderstand my point. Not backing up files on your hard drive because they're in Dropbox is not safe. Dropbox has built in functionality to delete those f

You misunderstand my point. Not backing up files on your hard drive because they're in Dropbox is not safe. Dropbox has built in functionality to delete those files from your hard drive. If any one of your clients or your account is compromised, or the Dropbox service is hacked, these files could disappear. Hence why you need backups. Also, if the FBI starts pulling servers in a random order to shut Dropbox down, are you confident that wont cause Dropbox's systems to incorrectly send delete commands to your client just before the service disappears? If you are, you shouldn't be. Not after the "log in to any account without a password" issue of last year.