I just updated from pihole v2.11 to pihole v2.12.1 using the pihole -up command.
When I restarted the lighttpd service I got an error that port 80 is already in use. I ran lighttpd on port 9555 on version 2.11 because my synology already uses port 80 for other stuff. Is it intended behaviour that pihole -up overwrites your config files or is this a bug?
If intended behaviour, I will make some backups of my config files before updating in the future.