You can serve files to umap from elsewhere e.g. I update my projects nightly and server from github as described here https://hackmd.io/OkwpRqQ7QXC3p8C0jfTUGQ?view

For local generation you could use osmium as described here https://hackmd.io/XfrY334rS7CV0tnPzx8Wvw but I’m afraid it’s very heavy for the whole planet.

Feel free to ask about both above, but I think the most sane way is probably using real DB with daily/hourly increments (I don’t have experience with this).