Hackers didn't even have to guess. Podesta gave it to them via a spear phishing ploy. With access to the email, a route to the DNC servers was exposed. The servers had no anti-hacking software. Even, the old cracked screen laptop I'm using now has pretty good such software. I've a much better one, which I use some. I back up most important stuff. The stuff I don't wish exposed is on an encrypted thumb drive. Paranoid, but of course. If one isn't paranoid, nowadays, one is insane.