It'd be neat if there were a feature to have pihole backup your whitelist & blacklist online to a secret github gist: https://gist.github.com/
I realise there is the Pi-hole Teleporter feature, but I think having those lists backed up online automatically to a secret gist would be very handy.
I don't think it would be too hard to implement & to enable it, the user would just generate a github token with only gist rights and then paste that and the gist id in to the web admin settings.
