You're trusting them to not have issues like this: https://blogs.dropbox.com/dropbox/2011/06/yesterdays-authentication-bug/ https://blogs.dropbox.com/dropbox/20

You're trusting them to not have issues like this: https://blogs.dropbox.com/dropbox/2011/06/yesterdays-authentication-bug/ https://blogs.dropbox.com/dropbox/2011/06/yesterdays-authent... I don't trust the servers (Dropbox or my), and thus I want it encrypted on my computer prior to sending it out on the Internet.