From the 60 Minutes interview with Krebs:
Scott Pelley: So back in 2017, as you're looking ahead to the election in 2018 and then ultimately the election in 2020, you have a to-do list. And the to-do list includes what?
Chris Krebs: Paper ballots. Paper ballots give you the ability to audit, to go back and check the tape and make sure that you got the count right. And that's really one of the keys to success for a secure 2020 election. 95% of the ballots cast in the 2020 election had a paper record associated with it. Compared to 2016, about 82%.
Scott Pelley: And with a paper record, you can go back and verify what the machine is saying by physically counting the paper?
Chris Krebs: That gives you the ability to prove that there was no malicious algorithm or hacked software that adjusted the tally of the vote, and just look at what happened in Georgia. Georgia has machines that tabulate the vote. They then held a hand recount and the outcome was consistent with the machine vote.
Scott Pelley: And that tells you what?
Chris Krebs: That tells you that there was no manipulation of the vote on the machine count side. And so that pretty thoroughly, in my opinion, debunks some of these sensational claims out there-- that I've called nonsense and a hoax, that there is some hacking of these election vendors and their software and their systems across the country. It's-- it's just-- it's nonsense.