diff --git a/frontend/app/routes.py b/frontend/app/routes.py
index f0f6a18..3699c96 100644
--- a/frontend/app/routes.py
+++ b/frontend/app/routes.py
@@ -1,8 +1,10 @@
 from __future__ import annotations
 
+import json
 import re
 import shutil
 import subprocess
+import tempfile
 import threading
 import uuid
 from pathlib import Path
@@ -40,6 +42,7 @@ YOUTUBE_POSTPROCESS_HINTS = (
     "destination",
 )
 INVALID_FILENAME_CHARS_PATTERN = re.compile(r"[<>:\"/\\|?*\x00-\x1f]")
+YOUTUBE_JOBS_DIR = Path(tempfile.gettempdir()) / "pysonnerie-youtube-jobs"
 _YOUTUBE_JOBS_LOCK = threading.Lock()
 _YOUTUBE_JOBS: dict[str, dict[str, object]] = {}
 
@@ -186,21 +189,40 @@ def _extract_progress_percent(line: str) -> float | None:
 
 
 def _set_youtube_job_state(job_id: str, **updates: object) -> None:
+    YOUTUBE_JOBS_DIR.mkdir(parents=True, exist_ok=True)
+    job_path = YOUTUBE_JOBS_DIR / f"{job_id}.json"
+
     with _YOUTUBE_JOBS_LOCK:
         current = _YOUTUBE_JOBS.get(job_id)
+        if current is None and job_path.exists():
+            try:
+                current = json.loads(job_path.read_text(encoding="utf-8"))
+            except Exception:
+                current = None
         if current is None:
-            return
+            current = {}
         current.update(updates)
+        _YOUTUBE_JOBS[job_id] = current
+
+        tmp_path = job_path.with_suffix(".json.tmp")
+        tmp_path.write_text(json.dumps(current, ensure_ascii=False), encoding="utf-8")
+        tmp_path.replace(job_path)
 
 
 def _create_youtube_job() -> str:
     job_id = uuid.uuid4().hex
+    YOUTUBE_JOBS_DIR.mkdir(parents=True, exist_ok=True)
+    payload = {
+        "status": "running",
+        "percent": 0.0,
+        "message": "Préparation du téléchargement...",
+    }
     with _YOUTUBE_JOBS_LOCK:
-        _YOUTUBE_JOBS[job_id] = {
-            "status": "running",
-            "percent": 0.0,
-            "message": "Préparation du téléchargement...",
-        }
+        _YOUTUBE_JOBS[job_id] = payload
+        job_path = YOUTUBE_JOBS_DIR / f"{job_id}.json"
+        tmp_path = job_path.with_suffix(".json.tmp")
+        tmp_path.write_text(json.dumps(payload, ensure_ascii=False), encoding="utf-8")
+        tmp_path.replace(job_path)
     return job_id
 
 
@@ -721,6 +743,13 @@ def youtube_download_status(job_id: str) -> Response:
 
     with _YOUTUBE_JOBS_LOCK:
         job = _YOUTUBE_JOBS.get(job_id)
+        if job is None:
+            job_path = YOUTUBE_JOBS_DIR / f"{job_id}.json"
+            if job_path.exists():
+                try:
+                    job = json.loads(job_path.read_text(encoding="utf-8"))
+                except Exception:
+                    job = None
         if job is None:
             return jsonify({"ok": False, "error": "Téléchargement introuvable."}), 404
         payload = {