Haha this was a powermove. It is genuinely great that since it’s just a file you can host it anywhere you want. S3, WebDAV, your own site. I personally use copyparty and WireGuard for my kdbx file. I find it better than syncthing because there’s an obvious master copy (edited in place), and there’s no good way to keep syncthing running all the time on iOS, which can lead to sync conflicts.
Hello. I use copyparty on my LAN hosting the kdbx file. It is exposed via webdav for my phone's client (keepassium). It is always available for KeePassXC (you can use rclone or just webdav in the file explorer). This is backed up to b2 every hour. I use WireGuard to access the LAN when I am not home. My phone autoconnects to WireGuard as soon as it is on any network that is not my home network.
I sometimes casually include tokens in my comments (changing a few characters here and there) to make people gasp but parent is taking it to a different level.
