added Docker backup script

tools/backup_docker.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+# Check if the Docker Compose file was provided
+if [ $# -eq 0 ]; then
+    echo "No Docker Compose file provided"
+    exit 1
+fi
+
+COMPOSE_FILE=$1
+DIR=$(dirname "${COMPOSE_FILE}")
+BASE_DIR_NAME=$(basename "${DIR}")
+BACKUP_DIR=/mnt/backups/$BASE_DIR_NAME
+TIMESTAMP=$(date +"%Y%m%d%H%M%S")
+
+# Create a new backup directory for this stack if it doesn't already exist
+mkdir -p $BACKUP_DIR
+
+# Stop the Docker Compose stack
+docker-compose -f $COMPOSE_FILE down
+
+# Tarball the Docker Compose directory
+tar -czvf $BACKUP_DIR/"files_${DIR##*/}"_$TIMESTAMP.tar.gz -C / $DIR
+
+# Identify and save each Docker image used by the stack
+IMAGES=$(docker-compose -f $COMPOSE_FILE config | awk '{if ($1 == "image:") print $2;}')
+for IMAGE in $IMAGES; do
+    docker save $IMAGE | gzip > $BACKUP_DIR/"image_${IMAGE//[:\/]/_}"_$TIMESTAMP.tar.gz
+done
+
+# Restart the Docker Compose stack
+docker-compose -f $COMPOSE_FILE up -d