How often you need to do this depends on a bunch of factors, but at the most it will need to be done once a year. You do this by unplugging the freezer, emptying it, pulling a drain plug on the bottom, and letting the whole thing melt over the course of a few hours. Manuals need to be defrosted once a quarter-inch of ice has built up. The majority of upright freezers are frost-free, but there are some manual defrost options, which just hold a constant temperature. Once again, you can protect against this by vacuum-sealing or tightly wrapping your food. The downside to frost-free is a heightened risk of freezer burn. This means you’ll never have to manually defrost the inside, as you would likely have to with a chest freezer.
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