diff --git a/scripts/update.ps1 b/scripts/update.ps1
index 1a6553f..1a0a9d7 100644
--- a/scripts/update.ps1
+++ b/scripts/update.ps1
@@ -40,11 +40,15 @@ function Start-Portal {
 # Ausgeschlossene Ordner werden weder gesichert noch beim Rollback verändert.
 function Get-ExcludeNames {
     param([switch]$ForWipe)
-    $ex = if ($ForWipe) { @('.backup') } else { @('.backup','TempUpdate') }
+    # WICHTIG: Array strikt als Array aufbauen. 'if (){@(x)}' würde ein
+    # 1-Element-Array zu einem Skalar entpacken → '+=' verkettet dann Strings.
+    $ex = @('.backup')
+    if (-not $ForWipe) { $ex = $ex + 'TempUpdate' }
     $f  = Join-Path $root '.backupignore'
     if (Test-Path -LiteralPath $f) {
-        $ex += (Get-Content -LiteralPath $f | ForEach-Object { $_.Trim() } |
-                Where-Object { $_ -ne '' -and -not $_.StartsWith('#') })
+        $extra = @(Get-Content -LiteralPath $f | ForEach-Object { $_.Trim() } |
+                   Where-Object { $_ -ne '' -and -not $_.StartsWith('#') })
+        $ex = $ex + $extra
     }
     return $ex
 }
@@ -57,7 +61,7 @@ function New-Snapshot {
     $bk  = Join-Path $root '.backup'
     if (-not (Test-Path -LiteralPath $bk)) { New-Item -ItemType Directory -Path $bk -Force | Out-Null }
     $zip = Join-Path $bk "snapshot-$ts.zip"
-    $exclude = Get-ExcludeNames
+    $exclude = @(Get-ExcludeNames)
     $items = Get-ChildItem -LiteralPath $root -Force | Where-Object { $exclude -notcontains $_.Name }
     if (-not $items) { throw "Portal-Wurzel ist leer — nichts zu sichern." }
     Compress-Archive -Path $items.FullName -DestinationPath $zip -CompressionLevel Optimal -Force
@@ -77,7 +81,7 @@ function Restore-Snapshot {
     param([string]$Zip)
     # Wurzel leeren (außer .backup + .backupignore-Ordner), dann Snapshot zurückspielen.
     # Ausgeschlossene Content-Ordner bleiben unangetastet an Ort und Stelle.
-    $ex = Get-ExcludeNames -ForWipe
+    $ex = @(Get-ExcludeNames -ForWipe)
     Get-ChildItem -LiteralPath $root -Force | Where-Object { $ex -notcontains $_.Name } |
         Remove-Item -Recurse -Force -ErrorAction SilentlyContinue
     Expand-Archive -LiteralPath $Zip -DestinationPath $root -Force