Definitely save some pollen before culling them. Pollen I stuck in my freezer two years ago has been viable enough to make seeds in batches since, including about a hundred seeds I harvested last weekend from a few hand-pollinated lower branches. I mix it 1 part pollen to about 10 parts AP pollen (dried out in a toaster oven and cooled), which both helps to keep it dry and stretches it to brush on more effectively.