Acronis Access Advanced

or any another methods to prevent brute-force domain credentials

As it happens, there is no option to add captcha to the web page in the current implementation of Acronis Cyber Files (formerly Acronis Access Advanced or Acronis Files Advanced), this is just not a feature of the product. However, as another method to prevent brute force attacks, we have the 2-factor authentication via SMS for the web clients. Please check the details in our official documentation.