diff --git a/.gitea/workflows/backup.yml b/.gitea/workflows/backup.yml
index c744ba3..260eab6 100644
--- a/.gitea/workflows/backup.yml
+++ b/.gitea/workflows/backup.yml
@@ -66,6 +66,7 @@ jobs:
           TOTAL_SUCCESS=0
           TOTAL_SKIP=0
           TOTAL_ERROR=0
+          declare -a ERROR_BRANCHES=()
           TS_KST=$(TZ=Asia/Seoul date '+%Y%m%d_%H%M%S')
           REPORT_DIR="${ROOT_DIR}/backup_reports"
           mkdir -p "${REPORT_DIR}"
@@ -78,13 +79,28 @@ jobs:
           : > "${DECISIONS_LOG}"
           : > "${TIMINGS_LOG}"
 
+          record_error_branch() {
+            local repo="$1" branch="$2" reason="$3"
+            local label="${branch}"
+            if [[ -n "${repo}" ]]; then
+              label="${branch} (${repo})"
+            fi
+            if [[ -n "${reason}" ]]; then
+              label="${label}: ${reason}"
+            fi
+            ERROR_BRANCHES+=("${label}")
+          }
+
           notify_status() {
             local status="$1" repo="$2" branch="$3" mode="$4" start_epoch="$5" reason="${6:-}" details="${7:-}"
             local ts end_epoch duration text payload
             case "${status}" in
               success) ((++TOTAL_SUCCESS)) ;;
               skip) ((++TOTAL_SKIP)) ;;
-              error) ((++TOTAL_ERROR)) ;;
+              error)
+                ((++TOTAL_ERROR))
+                record_error_branch "${repo}" "${branch}" "${reason}"
+                ;;
             esac
             [[ -z "${NOTIFY_WEBHOOK}" ]] && return
             ts=$(TZ=Asia/Seoul date '+%Y-%m-%d %H:%M:%S %Z')
@@ -532,8 +548,15 @@ jobs:
           done
 
           TOTAL_PROCESSED=$((TOTAL_SUCCESS + TOTAL_SKIP + TOTAL_ERROR))
+          ERROR_LIST_TEXT=""
+          if (( TOTAL_ERROR > 0 )); then
+            ERROR_LIST_TEXT=$(printf '%s\n' "${ERROR_BRANCHES[@]}" | sort -u | paste -sd',' - | sed 's/,/, /g')
+          fi
           SUMMARY_TS=$(TZ=Asia/Seoul date '+%Y-%m-%d %H:%M:%S %Z')
           SUMMARY_TEXT="브랜치 동기화 완료: 총 ${TOTAL_PROCESSED}개 (성공 ${TOTAL_SUCCESS}, 동일로 건너뜀 ${TOTAL_SKIP}, 오류 ${TOTAL_ERROR}) - ${SUMMARY_TS}"
+          if (( TOTAL_ERROR > 0 )) && [[ -n "${ERROR_LIST_TEXT}" ]]; then
+            SUMMARY_TEXT="${SUMMARY_TEXT} | 오류 브랜치: ${ERROR_LIST_TEXT}"
+          fi
           echo "${SUMMARY_TEXT}"
           echo "보고서(마크다운)는 이후 스텝에서 생성됩니다."
           echo "${TOTAL_ERROR}" > "${REPORT_DIR}/exit_code"
@@ -546,14 +569,18 @@ jobs:
           fi
 
           if (( TOTAL_ERROR > 0 )); then
-            echo "::warning::One or more branches failed (${TOTAL_ERROR}). Proceeding to report generation..."
+            ERROR_LIST_NOTICE="${ERROR_LIST_TEXT:-미기록}"
+            echo "::warning::Branches failed (${TOTAL_ERROR}): ${ERROR_LIST_NOTICE}. Proceeding to report generation..."
+            echo "::notice::오류 브랜치 목록: ${ERROR_LIST_NOTICE}"
           fi
 
       - name: Build markdown report
         if: always()
         run: |
           set -euo pipefail
-          REPORT_DIR="${REPORT_DIR:-${GITHUB_WORKSPACE}/backup_reports}"
+          DEFAULT_WORKSPACE="${GITHUB_WORKSPACE:-$(pwd)}"
+          REPORT_DIR="${REPORT_DIR:-${DEFAULT_WORKSPACE}/backup_reports}"
+          mkdir -p "${REPORT_DIR}"
           TS="${REPORT_TS:-}"
           if [[ -z "${TS}" ]]; then
             shopt -s nullglob