Which of the following is NOT a backup option available in QuickBooks?

The option indicating that none of the listed choices are backup options is incorrect because all the other choices actually represent valid backup functionalities within QuickBooks.

QuickBooks provides the ability to manually back up files, allowing users to create a backup at their discretion. The software also has a feature for automatically backing up the data file upon closing QuickBooks, which ensures that users do not forget to save their work. Additionally, scheduling an unattended backup is another feature that permits users to set up regular backups without needing to manually initiate them each time.

Since each of these methods is a legitimate way of backing up data in QuickBooks, saying that none of the options are backup methods does not accurately reflect the software’s capabilities. Therefore, it's important to recognize that all the listed options are indeed available backup mechanisms within QuickBooks, solidifying the assertion that none of them are invalid choices.