Is the pilot's backup period a flight?

This person does not fly during the backup.

The pilot's alternate period is usually not counted as flight time, because the pilot did not actually perform the flight mission during the alternate period. Backup refers to the situation that pilots are ready to take over other pilots to perform flight tasks at any time when they are on standby. During the backup, the pilot stays at the backup location, such as the lounge or hotel near the airport, waiting for the flight mission.

The purpose of pilot backup is to ensure the continuity and safety of flight tasks. Reserve pilots can quickly take over the responsibilities of other pilots when necessary to deal with emergencies or ensure the smooth progress of flight plans.