title: How to prevent that keychain items will not be added to the backup?
body: <p>How to prevent that keychain items will not be added to the backup? As well into encrypted backups?
  When keychain (SecItem) item is configured like shown below, then this keychain item can be backed up and restored to another device.</p>
  
  <pre><code>let query = [
      String(kSecClass) : kSecClassGenericPassword,
      String(kSecAttrService) : "SecAttrService",
      String(kSecAttrAccount) : "SecAttrAccount",
      String(kSecValueData) : mobileId,
  ]
  </code></pre>
  
  <p>So, how to prevent that keychain item will not be backed up?</p>