What’s the best way to backup a Cockpit installation?
I tried the backup solution here – but it gives me a 500 error on the latest pull of Cockpit Next:
Is it enough to backup the /storage/ and /config/ folders – and then reinstall them into a fresh clone of cockpit?
I’m pretty sure /storage and /config, together with /bootstrap, if you used that is what you need on a fresh Cockpit Next. Try it out maybe? Shouldn’t take long to test.
Also, if your server got some sort of backup it should be enough 
The server I use, which is pretty cheap, have daily backup of all the files.
just backup the /config and /storage folder and you should be save 
Do you have a reciept how to access to this in the docker container?
if you’re using docker, I would suggest to look into VOLUMES and persistent storage solutions for docker.
I use the agentejo/cockpit image on Windows 10.
As I understand from the Dockerfile (https://github.com/agentejo/cockpit/blob/next/Dockerfile), the volume /var/www/html is not mounted. I know, this is a Docker topic, but how can I access to this directory?
Now I got it!
This is how to copy file/directories from a docker container (here named cockpit) to the host system:
$ docker cp cockpit:/var/www/html/storage .
$ docker cp cockpit:/var/www/html/config .
That’s what I need.
Is there any update? Is there any backup feature available in the mean while?