You see this page as BRS is trying to get some information about your server and, if applicable, the configuration of the site.
If the browser gets stuck at this page, first make sure that you do not have any browser extensions –such as NoScript– or any antivirus / firewall applications which might be blocking JavaScript on your site. If you are using a caching proxy, CDN, or something similar you need to temporarily disable it, or at least temporarily configure it to serve non-cached content.
If that doesn't help please try using a different computer, with a different browser and connected via a different ISP to the Internet. Sometimes computer policies, proxies and other network settings can interfere with web applications such as ANGIE or the site script you are restoring.
The next page is platform specific: