The simple answer is that yes, you can freeze spaghetti and meatballs. In fact, real Italian tomato sauce is a classic option for freezing. Resealable freezer bags are a practical solution for storing leftovers. Before you seal the bag, you'll need to remove as much air as you can.
Remember to label the bag with the date and contents before placing it in the freezer. Cooked spaghetti or any type of pasta can be stored in the freezer for up to three months.