diff --git a/bin/backup.sh b/bin/backup.sh
index 7dc32a5..eda767b 100755
--- a/bin/backup.sh
+++ b/bin/backup.sh
@@ -209,8 +209,10 @@ backup_folders() {
     # 执行打包
     log_info "开始打包文件夹..."
     log_info "排除规则: ${exclude_args}"
-    # 将 tar 输出重定向到 stderr，避免干扰函数返回值
-    if eval "tar -czf '${folders_tar}' ${exclude_args} ${tar_sources}" 2>&1 >&2; then
+    # 将 tar 的 stdout 和 stderr 都重定向到 stderr，避免干扰函数返回值
+    eval "tar -czf '${folders_tar}' ${exclude_args} ${tar_sources}" >&2 2>&1
+
+    if [[ -f "${folders_tar}" ]]; then
         local tar_size=$(du -h "${folders_tar}" | cut -f1)
         log_info "文件夹备份完成: ${folders_tar} (大小: ${tar_size})"
         echo "${folders_tar}"