diff --git a/deploy/backup-db.sh b/deploy/backup-db.sh
index c4965629..562c3603 100755
--- a/deploy/backup-db.sh
+++ b/deploy/backup-db.sh
@@ -76,6 +76,14 @@ run_backup_tool() {
   docker compose run --rm --no-deps -T backend node dist/db-backup.js "$@"
 }
 
+ensure_backup_tool() {
+  if docker compose run --rm --no-deps -T backend test -f /app/dist/db-backup.js >/dev/null 2>&1; then
+    return
+  fi
+
+  fail "当前 backend 镜像不包含 dist/db-backup.js,请先执行 docker compose build backend 重建镜像,再重新运行本脚本。"
+}
+
 run_pg_dump() {
   local database_url
   database_url="$(read_env_value DATABASE_URL)"
@@ -164,6 +172,8 @@ main() {
     fail "backend 镜像不存在,请先完成部署:bash deploy/ubuntu-deploy.sh"
   fi
 
+  ensure_backup_tool
+
   mkdir -p "${DB_DIR}" "${CONFIG_DIR}"
   backup_database
   backup_configs