As I noted in this post, when DOJ proved the hacking case on ANOTHER of Ivan Ermakov hacks, they didn't get the servers of the victims, but they did get the interim servers (as I've been told happened under Mueller).
How the Government Proved Their Case against John Podesta's Hacker - emptywheel
We're almost seven years past the hack of the DNC, and self-imagined contrarians are still clinging to conspiracy theories about the attribution of that and related hacks.In recent weeks, both Matt Taibbi and Jeff Gerth dodged questions about the attribution showing Russia's role in the hack-and-leak by saying that the Mueller indictment of twelve GRU officers would never be tested in court (even while, especially in Gerth's case, relying on unsubstantiated claims in John Durham indictments from his two failed prosecutions).