I think the 64gb is sufficient. Beyond that cloud storage is probably the way to go. I also use the Kingston widrive, there is also the Seagate wifi HDD, I think that is 500gb.
Yes you go right ahead and use Cloud storage. You think you have security issues now....you haven't seen anything yet. Do you actually believe that all your personal files, photos, information about you, your family, the love of your life, your children, your boss, menstrual cycles, etc, are really just archived on some huge supercomputer located who knows where with your data protected by biometrics will be kept private and accessible ONLY by you?
Fat chance....