diff --git a/AdHoc-Backup.ps1 b/AdHoc-Backup.ps1
index bc3661b..bd64b27 100644
--- a/AdHoc-Backup.ps1
+++ b/AdHoc-Backup.ps1
@@ -473,14 +473,15 @@ function Backup-SqlDatabases {
 
     # --- PRE-FLIGHT: Concedi a NT AUTHORITY\SYSTEM il permesso server-level 'BACKUP ANY DATABASE' ---
     try {
-        $sqlGrant = @'
-USE master;
-IF NOT EXISTS (SELECT 1 FROM sys.server_principals WHERE name = N'NT AUTHORITY\SYSTEM')
-    CREATE LOGIN [NT AUTHORITY\SYSTEM] FROM WINDOWS;
-GRANT BACKUP ANY DATABASE TO [NT AUTHORITY\SYSTEM];
-'@
+        $sqlLines = @(
+            'USE master;'
+            "IF NOT EXISTS (SELECT 1 FROM sys.server_principals WHERE name = N'NT AUTHORITY\\SYSTEM')"
+            '    CREATE LOGIN [NT AUTHORITY\SYSTEM] FROM WINDOWS;'
+            "GRANT BACKUP ANY DATABASE TO [NT AUTHORITY\\SYSTEM];"
+        )
+        $sqlGrant = [string]::Join("`r`n", $sqlLines)
         $tmpGrant = Join-Path $Paths.SqlStage "grant_SYSTEM_server.sql"
-        $sqlGrant | Out-File -LiteralPath $tmpGrant -Encoding ASCII -Force
+        Set-Content -LiteralPath $tmpGrant -Value $sqlGrant -Encoding ASCII
 
         $grantArgs = Build-SqlcmdArgs -WindowsAuth:$SqlUseWindowsAuth -User $SqlUser -Password $SqlPassword -Instance $SqlInstance -InputFile $tmpGrant
         Log-SqlcmdArgsSafe -Args $grantArgs