Simple docker backup

backup.sh

#!/bin/bash

set -e
set -u

CONTAINER=$(docker ps -a --no-trunc | awk 'NR>1' | awk 'BEGIN {FS="  +"}; $5 ~ "^Up" {print $1}')

for C in $CONTAINER; do
	echo "Backup for $C"
	DATA=$(docker inspect $C)
	VOLS=$(echo "$DATA" | jq -r '.[0].Volumes|to_entries[].key' | tr '\n' ' ')
	DESTVOL="$C""_volumes.tar.gz"
	DESTINS="$C""_inspect.json"
	CMD="tar czfP - $VOLS"
	docker run --rm -i --volumes-from $C ubuntu $CMD > $DESTVOL
	echo "$DATA" > $DESTINS
done