Backing up Kibana dashboards

im pretty new to all of this, currently my setup consists of 3 ES instances and dockerized Kibana and Logstash.
before i also had ES dockerized but i struggled with the backing FS as i used a networkFS with docker swarm.
so i migrated to bare metal and tried to move my data via snapshot. but i wasnt able to restore most of my Kibana data, especially my dashboards. so is there an official procedure on how to back-up dashboard data or can anyone point me to a how-to?
i understand that this data sits in some .kibana (system) index, but i wasnt able to identify which and restoring all of them from my snapshot wasnt working at all.
thanks in advance.

Hello,

you can export and import all Kibana Objects via the Saved Objects GUI in Stack Management (under Kibana).

I think that is the official way.
There is also an API to automate this:
Export objects API | Kibana Guide [8.15] | Elastic
Import objects API | Kibana Guide [8.15] | Elastic

BR