You can, but for best results only store for 1 to 2 days. Simply wrap the completely cooled leftover bread in the foil again, pop into a food storage bag or airtight container and store in the fridge. Alternatively, you can freeze it for up to a month. When ready to reheat, reheat still wrapped in the foil in the air fryer heated to 340F/170C for around 5 minutes or until hot and crisp again.