diff --git a/.env.example b/.env.example
index c4f8eaa..01a4abc 100644
--- a/.env.example
+++ b/.env.example
@@ -38,4 +38,6 @@ STORAGE_CACHE_SECONDS=900
 # Optional: SMART-Abfragen aktivieren (benötigt Zugriff auf Host-Devices)
 SMART_ENABLED=false
 HOST_SYS_PATH=/host-sys
+LOG_FILE=/data/media-max.log
+LOG_RETENTION_HOURS=6
 LOG_LEVEL=INFO
diff --git a/app.py b/app.py
index 0a8d0b7..e2f8cfd 100644
--- a/app.py
+++ b/app.py
@@ -1,5 +1,6 @@
 import json
 import logging
+from logging.handlers import TimedRotatingFileHandler
 import os
 import sqlite3
 import subprocess
@@ -44,9 +45,17 @@ HOST_DEVICE_PATH = os.environ.get("HOST_DEVICE_PATH", "/host-dev")
 HOST_SYS_PATH = os.environ.get("HOST_SYS_PATH", "/host-sys")
 STORAGE_CACHE_SECONDS = int(os.environ.get("STORAGE_CACHE_SECONDS", "900"))
 SMART_ENABLED = os.environ.get("SMART_ENABLED", "false").lower() in {"1", "true", "yes", "on"}
+LOG_FILE = os.environ.get("LOG_FILE", "/data/media-max.log")
+LOG_RETENTION_HOURS = max(1, int(os.environ.get("LOG_RETENTION_HOURS", "6")))
 
 logging.basicConfig(level=os.environ.get("LOG_LEVEL", "INFO").upper(), format="%(asctime)s %(levelname)s %(message)s")
 log = logging.getLogger("media-max")
+try:
+    file_handler = TimedRotatingFileHandler(LOG_FILE, when="H", interval=LOG_RETENTION_HOURS, backupCount=1, encoding="utf-8", delay=True, utc=True)
+    file_handler.setFormatter(logging.Formatter("%(asctime)s %(levelname)s %(message)s"))
+    log.addHandler(file_handler)
+except OSError as exc:
+    log.warning("Datei-Logging nicht verfügbar (%s): %s", LOG_FILE, exc)
 app = Flask(__name__)
 executor = ThreadPoolExecutor(max_workers=int(os.environ.get("SCAN_WORKERS", "2")))
 scan_executor = ThreadPoolExecutor(max_workers=int(os.environ.get("SCAN_WORKERS", "4")))
@@ -233,12 +242,12 @@ def scan_datastore_storage():
             "free": format_bytes(usage.free), "percent": round(usage.used / usage.total * 100, 1) if usage.total else 0,
             "categories": values, "scanned_at": time.time()}
 
-def _read_command(command, timeout=4):
+def _read_command(command, timeout=4, warn_on_nonzero=True):
     command_text = " ".join(str(part) for part in command)
     log.debug("Systembefehl gestartet: %s", command_text)
     try:
         result = subprocess.run(command, capture_output=True, text=True, timeout=timeout, check=False)
-        if result.returncode != 0:
+        if result.returncode != 0 and warn_on_nonzero:
             log.warning("Systembefehl beendet mit Code %s: %s%s", result.returncode, command_text, f" · {result.stderr.strip()[:180]}" if result.stderr.strip() else "")
         return result.stdout, result.stderr
     except (OSError, subprocess.SubprocessError) as exc:
@@ -386,9 +395,9 @@ def raid_status():
             hardware_log_once.add(serial_log_key)
         if SMART_ENABLED and shutil.which("smartctl"):
             smart_device = disk["device"].replace("/dev/", f"{HOST_DEVICE_PATH.rstrip('/')}/", 1)
-            smart_output, smart_error = _read_command(["smartctl", "-H", smart_device], timeout=6)
+            smart_output, smart_error = _read_command(["smartctl", "-H", smart_device], timeout=6, warn_on_nonzero=False)
             if not re.search(r"(?:overall-health|Health Status|SMART support is)", smart_output, re.IGNORECASE):
-                sat_output, sat_error = _read_command(["smartctl", "-H", "-d", "sat", smart_device], timeout=6)
+                sat_output, sat_error = _read_command(["smartctl", "-H", "-d", "sat", smart_device], timeout=6, warn_on_nonzero=False)
                 if sat_output:
                     smart_output, smart_error = sat_output, sat_error
             health = re.search(r"(?:SMART overall-health self-assessment test result|SMART Health Status):\s*(.+)", smart_output, re.IGNORECASE)