diff --git a/tools/docker_backup.sh b/tools/docker_backup.sh
new file mode 100755
index 0000000..5d566c9
--- /dev/null
+++ b/tools/docker_backup.sh
@@ -0,0 +1,43 @@
+#!/bin/bash
+
+set -e
+
+# =====================
+# 参数检查
+if [[ $# -lt 2 ]]; then
+  echo "用法: $0 <容器名> <镜像名> [保留备份个数]"
+  echo "示例: $0 dev-env dev-env 3"
+  exit 1
+fi
+
+CONTAINER_NAME="$1"
+IMAGE_NAME="$2"
+KEEP_BACKUPS="${3:-3}"  # 默认保留 3 个
+# =====================
+
+TAG_LATEST="${IMAGE_NAME}:latest"
+BACKUP_TAG="${IMAGE_NAME}:backup-$(date +%Y%m%d-%H%M%S)"
+
+echo "📦 正在为镜像 '${TAG_LATEST}' 生成备份..."
+docker tag "${TAG_LATEST}" "${BACKUP_TAG}"
+echo "✅ 备份完成: ${BACKUP_TAG}"
+
+echo "📝 提交容器 '${CONTAINER_NAME}' 到镜像 '${TAG_LATEST}'..."
+docker commit "${CONTAINER_NAME}" "${TAG_LATEST}"
+echo "✅ 提交完成: ${TAG_LATEST}"
+
+echo "🧹 清理多余的备份，只保留最近 ${KEEP_BACKUPS} 个..."
+# 找出多余的备份镜像
+BACKUPS=$(docker images --format "{{.Repository}}:{{.Tag}} {{.CreatedAt}}" | grep "${IMAGE_NAME}:backup-" | sort -r -k2 | awk '{print $1}')
+
+COUNT=0
+for b in ${BACKUPS}; do
+    COUNT=$((COUNT+1))
+    if [ $COUNT -gt ${KEEP_BACKUPS} ]; then
+        echo "🗑️  删除旧备份: ${b}"
+        docker rmi "${b}"
+    fi
+done
+
+echo "🎉 完成！"
+docker images | grep "${IMAGE_NAME}"
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