So, just how many state secrets were lost to Russia and China because of Mrs. Clinton's gross negligence? The odds favor "lots."
If you sent emails through foreign telecoms that contained classified material, you can be sure they had a copy. She did. If you set up an email server without a digital certificate, you've ignored the most basic part of internet security. She did. And that doesn't touch the physical security of the servers, which were apparently kept in a bathroom closet at the mom and pop shop (albeit politically well-connected shop) that she hired to do all this.
No one would believe this story if you wrote it into a novel or a movie.