Sorry I have to disagree on this one. I've just made 30 kgs of dried tomatoes in the oven. Firstly, you must make sure they're unblemished tomatoes - any imperfections will affect the final flavour and might cause mould. Wash them, slice them in half lengthwise. Place on a baking sheet and sprinkle liberally with sea salt (you can always wash off the excess salt later if you wish). Bake at 225º for about 8 hours. Your tomatoes will wrinkle and turn a darker shade of red. Turn off the oven and remove the dried tomatoes. Plonk them into a brown paper bag. That is how to store them. I've been doing so for over 10 years in a tropical climate. NO problems. There is absolutely no need to keep them in the fridge; in fact, I've just bought 6 kgs of imported Italian sundried tomatoes which are sold in large plastic bags.