"Someone working in the EDT time zone with a computer directly connected to the DNC server ... copied 1,976 MegaBytes of data in 87 seconds onto an external storage device. That speed is many times faster than what is physically possible with a hack."
Also, you didn't ask for this specifically, but here's a link explaining how the DNC emails were leaked by a DNC insider, they weren't hacked.
https://www.zerohedge.com/news/2017-07-24/nsa-officials-and-computer-expert-forensic-evidence-proves-dnc-emails-were-leaked-no
Perhaps the most significant quote is:
"Someone working in the EDT time zone with a computer directly connected to the DNC server ... copied 1,976 MegaBytes of data in 87 seconds onto an external storage device. That speed is many times faster than what is physically possible with a hack."