Best practice upgrading to new OS while preserving PiHole configs?

[rjalex]

Dear friends,
I have been running PiHole from a Raspbian raspberry for a while now and love it and thank you all contributing for such a wonderful software.

In some time I will have to upgrade the OS flashing it with the future Raspbian Bullseye release.

What is the best practice to migrate my current PiHole installation with all of its settings to the new OS?

Thank you in advance.

[RonV42]

I run Pi-hole in docker so all I normally do is shutdown the container copy the directory to the new system and start it back up again. Easy-peasy.

For a standalone teleporter is your friend, in settings you can backup you Pi-hole and bring the settings across with a new install.