No evidence HRC's server was hacked.
According to 13 US intelligence agencies John Podesta and the DNC's emails were hacked by Russian intelligence. The emails were than released by Wikipedia on a schedule ideally suited to the Trump campaign.
No direct link ("collusion") was found between the Trump campaign and the leaks but Roger Stone and others were in constant contact with both the Trump campaign and Wikileaks.
It was the FBI that report HRC had classified info on her server. She admitted it but said it was an accident.