Upgrade Server from Debian 11 to 12

How do I go about upgrading a Hestia server that is on Debian 11 to Debian 12?

You do it the same way as every previous upgrade. Always keep your modified configuration files. Be sure to back up your system before you start.

The nixCraft and official Debian guides should be helpful. The auto-generated guide in the Summarizer does pretty well, except for the step that suggests booting to a console using installation media. That suggestion is preposterous. You can find all of those in the Brave Search results.

Thanks for this, which configurations are you talking about backing up?

What is the best way to backup any and all configs just in case please?