This is how it works in India: Once we click the button for a candidate, There will be light highlighting the selection on the voting machine. A printer that is connected to the voting machine prints the voted candidate symbol (and name?) and shows us the printed paper through a glass for a few seconds for verification and then drops it in.

Later during the counting procedure, random ballots are counted for both. If someone arises some issues about the voting, those are then counted using printed ballot papers.