Catalina Time Machine backups of apps
I am new to Catalina so this might be a daft question but my Time Machine backups only show apps in the Applications folder that were either downloaded from the app store or from a third party vendor. None of the system apps such as Preview, Contacts, Reminders, Notes or any of the Utilities show. Is this how it should be and, if so, how would I recover one of the system apps that was inadvertently deleted?