Government backups live forever. Getting things back can be troublesome but email archives are the easiest to get back.
I had said before yesterday's hearing that they needed the head of IT sitting next to Koskinen. I did not watch every minutes, but I have not seen that they really drilled down on SOP of data retention. There were several opening for precise followup of his answers, but most of the committee seemed determined to follow his own script.
Frustrating.