diff --git a/backup-dev-db.sh b/backup-dev-db.sh
new file mode 100755
index 0000000..dd56fa0
--- /dev/null
+++ b/backup-dev-db.sh
@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+DB_HOST="primary"
+DB_PORT="3306"
+DB_NAME="play-with"
+DB_USER="root"
+DB_PASSWORD="123456"
+
+stamp="$(date +%F)"
+backup_dir="yunpei/backup/dev/${stamp}"
+mkdir -p "${backup_dir}"
+
+echo "[backup] dumping ${DB_NAME} from ${DB_HOST}:${DB_PORT} -> ${backup_dir}/dev.sql.gz"
+mysqldump -h "${DB_HOST}" -P "${DB_PORT}" -u "${DB_USER}" -p"${DB_PASSWORD}" "${DB_NAME}" \
+  | gzip > "${backup_dir}/dev.sql.gz"
+
+echo "[backup] done"