Comment by isitademocracy

Election day is open to oversight from all political parties. All parties send their people (identified with badges, previously registered with the voting authority) and they have free access to all voting locations.

At the end of the day, the bag of paper votes is transported with their oversight (multiple parties from opposing sides) to a public place where all of them will count the papers, together, in a public session, with cameras.

It's actually what already happens when the e-voting machines fail and your backup also fails. You cast votes with paper and the votes are counted with this exact same process, with oversight from all parties.