Of course they don't store your entire genome; 99.9% of that is identical for all humans. That has no value to them at all. It's only the 0.1% that can vary bet

Of course they don't store your entire genome; 99.9% of that is identical for all humans. That has no value to them at all. It's only the 0.1% that can vary between humans that's of any interest. (Note that there are very different ways to measure that percentage and they can mean very different things. I'm not intending these percentages to be accurate, but I'm sure you get my point.)