I don't recommend saving this paella because it contains shellfish. If you have leftovers make sure you refrigerate them as soon as they are cool and eat them within 24 hours. Make sure you reheat the paella thoroughly on the stove or in the microwave. The paella will last a little longer without the prawns/shrimp. If you are intending to eat it over two days I recommend sautéing the prawns/shrimp separately and adding them to the portion that you are going to eat. You can then cook up some fresh prawns/shrimp when you come to eat the leftovers. The paella is not suitable for freezing.