First docker copy from container to host ( after install)
- or docker export and copy from backup ( prefer after install servers ex: pgsql)
https://docs.docker.com/engine/userguide/containers/dockervolumes/#mount-a-host-directory-as-a-data-volume
- This command mounts the host directory, /src/webapp, into the container at /opt/webapp. țțțIf the path /opt/webapp already exists inside the container’s image, the /src/webapp mount overlays but does not remove the pre-existing content. Once the mount is removed, the content is accessible again. This is consistent with the expected behavior of the mount command.
- I don't have to delete the initial content.

Security

Because of limitations in the mount function, moving subdirectories within the host’s source directory can give access from the container to the host’s file system. This requires a malicious user with access to host and its mounted directory.

Don't

Data	Docker +
Docker	Data +