My mom kept a glass jar of bacon fat in the kitchen cabinet under the sink. She'd use a bit for cooking eggs or some meats, maybe some other things I didn't notice. She would use some, then add some back when cooking more bacon, and rarely ever emptied and washed the jar. It never went bad.
So now that I am eating some meat again, I started a jar in the cabinet under my sink... makes fried or scrambled eggs taste amazing! Also I use it in
beef bourginon sauce, adds to the final flavor nicely without tasting specifically bacon-y. Lovely to saute green beans in too, although you can just use some actual bacon in with the beans and have the benefit of the crunchy bits.
I'd love to get some lard from a small-farm-raised pig to use for pie crusts! Unfortunately we don't have the acreage to raise pigs ourselves.