XKCD has put their thoughts in writing.
Low-tech paper ballots have made a sharp comeback in the ballot box. According to the Brennan Center for Justice, the proportions of paper versus digital have flipped in the past twelve years. Today, two-thirds of the electorate votes with paper and one-third with a electronic device. That said, the Center has pointed out that the lack of paper backups for the voter roll books are a continuing issue in many localities.
The reward for bad technology in the last election is awarded to Georgia Secretary of State and gubernatorial candidate Brian Kemp. As Secretary of State, the election process is his responsibility. But when Mr. Kemp went to vote on Election Day, he first got a voter card that said “invalid.” The second card worked. Other places in the state had issues with inaccurate voting registration books, insufficient numbers of machines, and voting machines with dead batteries. His failure to efficiently roll out the election technology while keeping his fingers in the vote-counting process – even as he was on the ballot for state governor – even drew a rebuke from former US President Jimmy Carter.
The major rule to be learned from this: Backups are essential – for you, for your devices,and for people running elections — unless having a breakdown swings the vote in your direction.