To copy data from the volume to the host, use a temporary container code example
Example: docker cp volume
Usage
docker cp [OPTIONS] CONTAINER:SRC_PATH DEST_PATH|-
docker cp [OPTIONS] SRC_PATH|- CONTAINER:DEST_PATH
To copy data from the volume to the host, use a temporary container that has the volume mounted.
CID=$(docker run -d -v hello:/hello busybox true)
docker cp $CID:/hello ./
To copy a directory from the host to volume
cd local_dir
docker cp . $CID:/hello/
Then clean up the temporary container.
docker rm $CID