Updated Updating (markdown)

Updating.md

@@ -64,6 +64,8 @@ docker-compose down
 
 # Only start the DB
 docker-compose up -d postgres
+
+# Take a DB backup
 docker-compose exec -T postgres sh -c 'pg_dump -cU $POSTGRES_USER $POSTGRES_DB' | gzip > db_dump.sql.gz
 
 # Stop the database and remove it's volme