I'm not sure about the recommended length of time (you may want to check with your local beef marketing organization), but I do know that if you double-wrap it (two plastic bags, openings at opposite ends, remove as much air as possible and seal it well), the food will be good for up to a year.
And if you're not sure about the potato dish? (I've not had much luck freezing ordinary potatoes: they get mushy. But my potato soup keeps beautifully in the freezer.) Make a small portion or your sweet potato dish and freeze it (or leftovers): see how it tastes after you've thawed it.
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