diff --git a/sac-client.sh b/sac-client.sh
index a1dd5d8..4284765 100644
--- a/sac-client.sh
+++ b/sac-client.sh
@@ -70,6 +70,74 @@ sac_spool_remove() {
  rm -f "${dir}/${event_id}.json"
 }
 
+# POST готового JSON (ingest / повтор из spool). Возврат 0 при HTTP 202.
+sac_post_payload() {
+ local payload="$1"
+ local event_id http_code tmp resp event_type
+
+ if ! sac_is_configured; then
+ return 1
+ fi
+ if [ "${DRY_RUN:-0}" = "1" ]; then
+ printf '[DRY-RUN SAC POST] %s\n' "$(printf '%s' "$payload" | head -c 120)" >&2
+ return 0
+ fi
+
+ event_id="$(printf '%s' "$payload" | python3 -c 'import json,sys; print(json.load(sys.stdin)["event_id"])')" || return 1
+ event_type="$(printf '%s' "$payload" | python3 -c 'import json,sys; print(json.load(sys.stdin).get("type","?"))')" || event_type="?"
+
+ tmp="$(mktemp)"
+ resp="$(mktemp)"
+ printf '%s' "$payload" >"$tmp"
+ http_code="$(curl -sS -o "$resp" -w '%{http_code}' \
+  -X POST "$(sac_ingest_url)" \
+  -H "Authorization: Bearer ${SAC_API_KEY}" \
+  -H "Content-Type: application/json" \
+  -H "Idempotency-Key: ${event_id}" \
+  --connect-timeout "${SAC_TIMEOUT_SEC:-12}" \
+  --max-time "${SAC_TIMEOUT_SEC:-12}" \
+  -d @"$tmp" 2>/dev/null || echo 000)"
+ rm -f "$tmp"
+
+ if [ "$http_code" = "202" ]; then
+ sac_spool_remove "$event_id" 2>/dev/null || true
+ write_log "SAC: принято event_id=$event_id type=$event_type"
+ return 0
+ fi
+
+ write_log "WARN: SAC POST HTTP $http_code: $(tr '\n' ' ' <"$resp" | head -c 200)"
+ sac_spool_write "$event_id" "$payload"
+ return 1
+}
+
+# Повторная отправка файлов из SAC_SPOOL_DIR (до max_files за вызов).
+sac_flush_spool() {
+ local mode max_files="${1:-20}"
+ mode="$(sac_normalize_mode "${UseSAC:-off}")"
+ case "$mode" in
+ off) return 0 ;;
+ esac
+ if ! sac_is_configured; then
+ return 0
+ fi
+
+ local dir="${SAC_SPOOL_DIR:-/var/lib/ssh-monitor/sac-spool}"
+ [ -d "$dir" ] || return 0
+
+ local f count=0
+ shopt -s nullglob
+ for f in "$dir"/*.json; do
+ [ -f "$f" ] || continue
+ count=$((count + 1))
+ [ "$count" -gt "$max_files" ] && break
+ local payload
+ payload="$(cat "$f")"
+ sac_post_payload "$payload" || true
+ done
+ shopt -u nullglob
+ return 0
+}
+
 # send_sac_event type severity title summary [details_json]
 sac_send_event() {
  local event_type="$1"
@@ -146,31 +214,7 @@ print(json.dumps(payload, ensure_ascii=False))
 PY
 )" || return 1
 
- event_id="$(printf '%s' "$payload" | python3 -c 'import json,sys; print(json.load(sys.stdin)["event_id"])')"
-
- local tmp resp
- tmp="$(mktemp)"
- resp="$(mktemp)"
- printf '%s' "$payload" >"$tmp"
- http_code="$(curl -sS -o "$resp" -w '%{http_code}' \
-  -X POST "$(sac_ingest_url)" \
-  -H "Authorization: Bearer ${SAC_API_KEY}" \
-  -H "Content-Type: application/json" \
-  -H "Idempotency-Key: ${event_id}" \
-  --connect-timeout "${SAC_TIMEOUT_SEC:-12}" \
-  --max-time "${SAC_TIMEOUT_SEC:-12}" \
-  -d @"$tmp" 2>/dev/null || echo 000)"
- rm -f "$tmp"
-
- if [ "$http_code" = "202" ]; then
- sac_spool_remove "$event_id" 2>/dev/null || true
- write_log "SAC: принято event_id=$event_id type=$event_type"
- return 0
- fi
-
- write_log "WARN: SAC POST HTTP $http_code: $(tr '\n' ' ' <"$resp" | head -c 200)"
- sac_spool_write "$event_id" "$payload"
- return 1
+ sac_post_payload "$payload"
 }
 
 # JSON details из переменных SAC_D_* (опционально)
@@ -227,6 +271,11 @@ notify_or_sac() {
 run_check_sac() {
  printf 'Проверка SAC (ssh-monitor)\n'
  printf 'UseSAC=%s\n' "${UseSAC:-off}"
+ case "$(sac_normalize_mode "${UseSAC:-off}")" in
+ exclusive) printf 'Режим exclusive: уведомления только в SAC (Telegram/email с агента не отправляются)\n' ;;
+ dual) printf 'Режим dual: SAC + локальные каналы NOTIFY_CHAIN\n' ;;
+ fallback) printf 'Режим fallback: SAC, при сбое — NOTIFY_CHAIN\n' ;;
+ esac
  printf 'SAC_URL=%s\n' "${SAC_URL:-}"
  if sac_is_configured; then
   printf 'SAC ingest URL=%s\n' "$(sac_ingest_url)"
diff --git a/scripts/pilot-verify-exclusive.sh b/scripts/pilot-verify-exclusive.sh
new file mode 100755
index 0000000..7c7f3fe
--- /dev/null
+++ b/scripts/pilot-verify-exclusive.sh
@@ -0,0 +1,41 @@
+#!/bin/bash
+# Проверка готовности хоста к пилоту UseSAC=exclusive (фаза 2.1).
+set -euo pipefail
+
+CONFIG="${CONFIG_FILE:-/etc/ssh-monitor.conf}"
+MONITOR="${SSH_MONITOR_BIN:-/usr/local/bin/ssh-monitor}"
+
+if [ -f "$CONFIG" ]; then
+ # shellcheck disable=SC1090
+ . "$CONFIG"
+fi
+
+fail=0
+ok() { printf '[OK] %s\n' "$1"; }
+bad() { printf '[FAIL] %s\n' "$1"; fail=1; }
+
+mode="$(printf '%s' "${UseSAC:-off}" | tr '[:upper:]' '[:lower:]')"
+[ "$mode" = "exclusive" ] || bad "UseSAC должен быть exclusive (сейчас: ${UseSAC:-off})"
+[ -n "${SAC_URL:-}" ] && [ -n "${SAC_API_KEY:-}" ] || bad "Задайте SAC_URL и SAC_API_KEY"
+[ -x "$MONITOR" ] || bad "Не найден $MONITOR"
+[ -f "${MONITOR%/*}/sac-client.sh" ] || bad "Нет sac-client.sh рядом с ssh-monitor"
+
+if "$MONITOR" --check-sac; then
+ ok "--check-sac"
+else
+ bad "--check-sac"
+fi
+
+spool="${SAC_SPOOL_DIR:-/var/lib/ssh-monitor/sac-spool}"
+pending=0
+if [ -d "$spool" ]; then
+ pending=$(find "$spool" -maxdepth 1 -name '*.json' 2>/dev/null | wc -l)
+fi
+printf '     Spool %s: %s файл(ов)\n' "$spool" "$pending"
+
+if [ "$fail" -eq 0 ]; then
+ printf '\nПилот exclusive: хост готов. Сгенерируйте SSH/sudo событие и проверьте только в SAC UI.\n'
+ exit 0
+fi
+printf '\nИсправьте ошибки выше.\n'
+exit 1
diff --git a/ssh-monitor b/ssh-monitor
index ac22c48..d37f971 100644
--- a/ssh-monitor
+++ b/ssh-monitor
@@ -1921,6 +1921,7 @@ main() {
  monitor_logind
  check_daily_report
  check_heartbeat
+ sac_flush_spool 20 2>/dev/null || true
  write_health_and_metrics
 
  local current_time
diff --git a/update_ssh_monitor.sh b/update_ssh_monitor.sh
index 71899cd..032a7c5 100755
--- a/update_ssh_monitor.sh
+++ b/update_ssh_monitor.sh
@@ -426,8 +426,9 @@ print_config_variables_help() {
        TELEGRAM_BOT_TOKEN, TELEGRAM_CHAT_ID
        — или MAIL_SMTP_HOST, MAIL_FROM, MAIL_TO
 
-     Security Alert Center (рекомендуется dual на пилоте):
-       UseSAC=dual
+     Security Alert Center:
+       UseSAC=off | dual | exclusive | fallback
+       Пилот 2.1 (только SAC): UseSAC=exclusive
        SAC_URL=https://sac.kalinamall.ru
        SAC_API_KEY=<ключ из SAC sac-api.env / bootstrap>