So, I have it running on a Pi 3 B+ which has BT 4.2 built in. You would indeed probably get even better range with a BT adapter and USB extension.

I’ve been running Bluehood the past couple weeks, on a Raspberry Pi that was otherwise collecting dust. I’m up to 2K Bluetooth devices spotted and I live on a slow, residential street. Its quite startling how easily you could stalk someone who travels around with Bluetooth on.

I just run teleporter on my primary and manually upload that backup to my secondary. My blocklists and local DNS dont change much, so its not a big concern of mine.

Nebula-Sync and Orbital-Sync may be of interest to you. It seems like you want to automate the syncing.

I’ve been running DietPi for years. Its so lightweight and stable. I love GUI-less Debian and its chefs kiss on a Raspberry Pi.