Ozy, I render my own lard and keep it frozen for such times as I need it, primarily for pie crusts. I either use pan drippings for gravy with a meal or discard them. Duck fat is the one exception to that rule, not a drop of it ever goes to waste.
I think almost everyone kept that container of saved grease on hand back in the day when our parents remembered the Great Depression. My Ma used a coffee can, and used the grease from it for gravies and for frying. When it got full she threw it away. I use butter or olive oil normally to make a roux or even fry a few slices of bacon if I'm in a devil may care mood about healthy eating.

Good coffee, good weed, and time on my hands...