There are two longer storage options for homemade tomato sauce: canning and freezing.u003cbr/u003eu003cbr/u003eI am not a canning expert, but there are plenty of tutorials online! I do know that nowadays tomatoes are not as acidic as they used to be, so you might have to add some lemon juice or vinegar to increase their acidity.u003cbr/u003eu003cbr/u003eI'll talk about freezing down below!