[1]: https://pi-hole.net
Last Nov I spent half day installing Pi-hole on spare Pi 2 and Pi 3 (Ubuntu LTS) serving as two internal DNS Servers for home network), router (AsusWrt-Merlin) as its upstream doing DoT (DNS over HTTPS). Really happy with the performance and cost (quite, low power consumption, no heating issue, no dust collection issue, etc.)
On Pi 2 and 3 it's no longer an issue (even if you don't do anything about it) to a memory buff and better I/O (using faster micro SD).
Pi-hole provides a mechanism to backup and rotate the database from time to time, one can do that whatever way suits their use cases.
Why'd I exempt my apple tv from the pi-hole? I don't want to screw things up when my wife or visitors are watching tv :)
Very wise. There are a lot of cool things I’d like to setup, but keeping things simple for guests and spouses matters.