Hillary’s awareness of vulnerability of confidential executive documents to the force of subpoena stems from her earliest days while serving the prosecution of Richard Nixon.
Doesn’t matter what the medium, any document in any form, no matter how well protected can come back to bite ones rump. That is the lesson she learned in the 70’s and reinforced during her husband’s time in the White House.
And the real scandal hasn’t really surfaced yet. What’s the real scandal? Foreign intelligence services reading her e-mails in real-time. When you’ve set up your own version of Hotmail, foreign countries hack that faster than you fix your kid’s bike.