How do I know the voting system recorded my vote the same way I cast it?

Extensive testing is performed before each election to verify the integrity of installed software and to ensure that the system is recording votes correctly. Additionally, the system uses paper ballots. Every voter uses the scanning machine to cast a paper ballot, regardless of whether the voter hand-marks the ballot or prints it from the ballot marking device. That original paper ballot is retained throughout the process and remains the official record of the vote. 

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1. Does the system use touchscreens?
2. How do I know my votes are private and there is not a database in the computer somewhere that records how I have voted?
3. How do I know the voting system recorded my vote the same way I cast it?
4. What if I change my mind or make a mistake on my ballot?
5. What if I don’t want to vote in a particular race?
6. What if I accidentally vote twice in a race? Will my vote be discarded?
7. How do I know that my vote has been cast and counted?
8. If the power fails or if there is some other system failure, will my vote be lost?
9. Does this system have paper backup?
10. What if a recount is necessary?