diff --git a/bin/backup.sh b/bin/backup.sh
index 8e2b544..38e3933 100755
--- a/bin/backup.sh
+++ b/bin/backup.sh
@@ -33,7 +33,8 @@ log() {
     local message="$@"
     local timestamp=$(date '+%Y-%m-%d %H:%M:%S')
 
-    echo -e "[${timestamp}] [${level}] ${message}"
+    # 输出到 stderr，避免干扰函数返回值
+    echo -e "[${timestamp}] [${level}] ${message}" >&2
 
     # 如果配置了日志文件，同时写入文件
     if [[ -n "${LOG_FILE}" ]] && [[ "${LOGGING_ENABLED}" == "true" ]]; then
@@ -207,11 +208,7 @@ backup_folders() {
 
     # 执行打包
     log_info "开始打包文件夹..."
-    eval "tar -czf '${folders_tar}' ${exclude_args} ${tar_sources}" 2>&1 | while read line; do
-        log_info "$line"
-    done
-
-    if [[ -f "${folders_tar}" ]]; then
+    if eval "tar -czf '${folders_tar}' ${exclude_args} ${tar_sources}" 2>&1; then
         log_info "文件夹备份完成: ${folders_tar}"
         echo "${folders_tar}"
     else
diff --git a/bin/cleanup.sh b/bin/cleanup.sh
index e6c0c3a..c4a1876 100755
--- a/bin/cleanup.sh
+++ b/bin/cleanup.sh
@@ -25,15 +25,15 @@ NC='\033[0m'
 ###############################################################################
 
 log_info() {
-    echo -e "${GREEN}[INFO]${NC} $@"
+    echo -e "${GREEN}[INFO]${NC} $@" >&2
 }
 
 log_warn() {
-    echo -e "${YELLOW}[WARN]${NC} $@"
+    echo -e "${YELLOW}[WARN]${NC} $@" >&2
 }
 
 log_error() {
-    echo -e "${RED}[ERROR]${NC} $@"
+    echo -e "${RED}[ERROR]${NC} $@" >&2
 }
 
 ###############################################################################