diff --git a/update-iventoy.sh b/update-iventoy.sh
index 4c1c603..ffc4ed0 100644
--- a/update-iventoy.sh
+++ b/update-iventoy.sh
@@ -12,9 +12,10 @@ CONFIG_FILE="${CONFIG_DIR}/config.dat"
 SERVICE="iventoy"
 
 TMP="/tmp/iventoy-update"
-
 GITHUB_REPO="ventoy/PXE"
 
+MAX_BACKUPS=10
+
 echo "=========================================="
 echo " iVentoy Update"
 echo "=========================================="
@@ -43,38 +44,10 @@ apt-get install -y -qq curl tar >/dev/null
 mkdir -p "$ISO_DIR"
 mkdir -p "$CONFIG_DIR"
 
-# --------------------------------------------------
-# Existing config sichern / initial übernehmen
-# --------------------------------------------------
-
-if [ ! -f "$CONFIG_FILE" ]; then
-
-    if [ -f "${CURRENT}/data/config.dat" ]; then
-        echo "Übernehme bestehende iVentoy Config..."
-        cp -a "${CURRENT}/data/config.dat" "$CONFIG_FILE"
-    else
-        echo "WARNUNG: Keine bestehende config.dat gefunden."
-    fi
-
-fi
-
-# Backup
-if [ -f "$CONFIG_FILE" ]; then
-
-    BACKUP="${CONFIG_FILE}.bak-$(date +%Y%m%d-%H%M%S)"
-
-    echo "Sichere Config nach:"
-    echo "  $BACKUP"
-
-    cp -a "$CONFIG_FILE" "$BACKUP"
-
-fi
-
 # --------------------------------------------------
 # Latest Version ermitteln
 # --------------------------------------------------
 
-echo
 echo "Ermittle aktuelle iVentoy-Version..."
 
 LATEST_TAG=$(
@@ -92,45 +65,101 @@ if [ -z "$VERSION" ]; then
     exit 1
 fi
 
-echo "Neueste Version: $VERSION"
-
 TARGET="${BASE}/iventoy-${VERSION}"
 
+echo "Neueste Version: $VERSION"
+
 # --------------------------------------------------
-# Prüfen ob bereits installiert
+# Prüfen ob bereits aktuell
+# --------------------------------------------------
+
+if [ -L "$CURRENT" ]; then
+    CURRENT_TARGET=$(readlink -f "$CURRENT" || true)
+
+    if [ "$CURRENT_TARGET" = "$TARGET" ]; then
+        echo
+        echo "=========================================="
+        echo " iVentoy ist bereits aktuell"
+        echo "=========================================="
+        echo
+        echo "Aktive Version: $VERSION"
+        echo "Installation:   $CURRENT -> $TARGET"
+        echo
+        exit 0
+    fi
+fi
+
+# --------------------------------------------------
+# Bestehende Config übernehmen
+# --------------------------------------------------
+
+if [ ! -f "$CONFIG_FILE" ]; then
+
+    if [ -f "${CURRENT}/data/config.dat" ]; then
+        echo
+        echo "Übernehme bestehende iVentoy Config..."
+        cp -a "${CURRENT}/data/config.dat" "$CONFIG_FILE"
+    else
+        echo
+        echo "WARNUNG: Keine bestehende config.dat gefunden."
+    fi
+
+fi
+
+# --------------------------------------------------
+# Config Backup
+# --------------------------------------------------
+
+if [ -f "$CONFIG_FILE" ]; then
+
+    BACKUP="${CONFIG_FILE}.bak-$(date +%Y%m%d-%H%M%S)"
+
+    echo
+    echo "Sichere Config:"
+    echo "  $BACKUP"
+
+    cp -a "$CONFIG_FILE" "$BACKUP"
+
+    # --------------------------------------------------
+    # Backup Rotation
+    # --------------------------------------------------
+
+    echo "Behalte maximal ${MAX_BACKUPS} Config-Backups..."
+
+    find "$CONFIG_DIR" \
+        -maxdepth 1 \
+        -type f \
+        -name 'config.dat.bak-*' \
+        -printf '%T@ %p\n' \
+        | sort -nr \
+        | tail -n +"$((MAX_BACKUPS + 1))" \
+        | cut -d' ' -f2- \
+        | xargs -r rm -f
+fi
+
+# --------------------------------------------------
+# Download / Entpacken
 # --------------------------------------------------
 
 if [ -d "$TARGET" ]; then
 
     echo
-    echo "Version $VERSION ist bereits unter"
+    echo "Version $VERSION ist bereits vorhanden:"
     echo "  $TARGET"
-    echo "vorhanden."
 
 else
 
-    # --------------------------------------------------
-    # Download
-    # --------------------------------------------------
-
     rm -rf "$TMP"
     mkdir -p "$TMP"
 
     ARCHIVE="iventoy-${VERSION}-linux-x86_64-free.tar.gz"
-
     URL="https://github.com/${GITHUB_REPO}/releases/download/v${VERSION}/${ARCHIVE}"
 
     echo
     echo "Lade herunter:"
     echo "  $URL"
 
-    curl -fL \
-        "$URL" \
-        -o "${TMP}/${ARCHIVE}"
-
-    # --------------------------------------------------
-    # Entpacken
-    # --------------------------------------------------
+    curl -fL "$URL" -o "${TMP}/${ARCHIVE}"
 
     echo
     echo "Entpacke iVentoy..."
@@ -140,7 +169,8 @@ else
     EXTRACTED="${TMP}/iventoy-${VERSION}"
 
     if [ ! -d "$EXTRACTED" ]; then
-        echo "ERROR: Erwartetes Verzeichnis $EXTRACTED nicht gefunden."
+        echo "ERROR: Erwartetes Verzeichnis wurde nicht gefunden:"
+        echo "  $EXTRACTED"
         exit 1
     fi
 
@@ -149,26 +179,25 @@ else
 fi
 
 # --------------------------------------------------
-# Symlinks vorbereiten
+# ISO Symlink
 # --------------------------------------------------
 
 echo
-echo "Setze persistente Verzeichnisse..."
-
-# ISO
+echo "Setze ISO-Symlink..."
 
 rm -rf "${TARGET}/iso"
 ln -s "$ISO_DIR" "${TARGET}/iso"
 
-# Config
+# --------------------------------------------------
+# Config Symlink
+# --------------------------------------------------
 
 if [ -f "$CONFIG_FILE" ]; then
 
-    rm -f "${TARGET}/data/config.dat"
+    echo "Setze Config-Symlink..."
 
-    ln -s \
-        "$CONFIG_FILE" \
-        "${TARGET}/data/config.dat"
+    rm -f "${TARGET}/data/config.dat"
+    ln -s "$CONFIG_FILE" "${TARGET}/data/config.dat"
 
 fi
 
@@ -184,14 +213,9 @@ systemctl stop "$SERVICE" 2>/dev/null || true
 sleep 2
 
 # --------------------------------------------------
-# Bestehende /opt/iventoy Installation migrieren
+# Alte direkte Installation sichern
 # --------------------------------------------------
 
-#
-# Falls /opt/iventoy beim allerersten Lauf noch ein echtes
-# Verzeichnis und kein Symlink ist.
-#
-
 if [ -e "$CURRENT" ] && [ ! -L "$CURRENT" ]; then
 
     OLD="${BASE}/iventoy-old-$(date +%Y%m%d-%H%M%S)"
@@ -215,7 +239,7 @@ ln -sfn "$TARGET" "${CURRENT}.new"
 mv -Tf "${CURRENT}.new" "$CURRENT"
 
 # --------------------------------------------------
-# Start
+# Service starten
 # --------------------------------------------------
 
 echo
@@ -246,19 +270,35 @@ if ! ss -lntH | awk '{print $4}' | grep -Eq '[:.]16000$'; then
     FAILED=1
 fi
 
+if ! ss -lnuH | awk '{print $4}' | grep -Eq '[:.]69$'; then
+    echo "ERROR: UDP 69 lauscht nicht."
+    FAILED=1
+fi
+
+if ! ss -lnuH | awk '{print $4}' | grep -Eq '[:.]4011$'; then
+    echo "ERROR: UDP 4011 lauscht nicht."
+    FAILED=1
+fi
+
+if ! ss -lnuH | awk '{print $4}' | grep -Eq '[:.]67$'; then
+    echo "ERROR: UDP 67 lauscht nicht."
+    FAILED=1
+fi
+
 if [ "$FAILED" -ne 0 ]; then
 
     echo
     echo "=========================================="
     echo " UPDATE FEHLGESCHLAGEN"
     echo "=========================================="
-
     echo
-    echo "iVentoy Log:"
-    tail -n 40 "${CURRENT}/log/log.txt" || true
+
+    if [ -f "${CURRENT}/log/log.txt" ]; then
+        echo "Letzte iVentoy Log-Einträge:"
+        tail -n 40 "${CURRENT}/log/log.txt" || true
+    fi
 
     exit 1
-
 fi
 
 # --------------------------------------------------
@@ -283,4 +323,7 @@ echo "  ${CURRENT}/data/config.dat -> $CONFIG_FILE"
 echo
 echo "ISO:"
 echo "  ${CURRENT}/iso -> $ISO_DIR"
+echo
+echo "Config-Backups:"
+echo "  maximal $MAX_BACKUPS"
 echo
\ No newline at end of file