And if you are right and the Secret Service or some other government entity set up some sort of secure basement email server for Hillary, then they should have set up a backup system for it. They are government employees and would know that they had to back up government records.
I just don't believe Hillary would entrust the Secret Server to set up a private secure email server for her State department business knowing that the government (Obama/ Jarrett) could access it.
Using the Secret Service or some other government entity to setup her email server would defeat the purpose of using her own server. She may as well have used the State Department's email server.
It would be a good question to find out who set up the server for her and where the back ups are maintained.