I have run two Docker images:
docker run --name=data mydata
docker run -p 8080:8080 --name=master --volumes-from=data -d mymaster
I need to have backups of the data container, just for security, and perhaps for a possible migration in the future.
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You can copy the data with the cp command (https://docs.docker.com/engine/reference/commandline/cp/ and the example is from this answer Copying files from host to Docker container)
docker cp foo.txt mycontainer:/foo.txt
docker cp mycontainer:/foo.txt foo.txt
You can get the name of your container with docker ps.
If you want to automate the whole thing, that's a chapter for itself.
