This is an optional page and you may not ever see it during your site's restoration. Read below for more information on when it is shown.
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BRS needs to save some information between page loads to work properly. This data is stored in files inside the installation/tmp directory of your site during the restoration. These files are named something like storagedata-0123456789abcdef0123456789abcdef.dat where 0123456789abcdef0123456789abcdef is a 32-character string which depends on some site-, browser-, and restoration-specific information.
Depending on your server and the way you extracted the backup archive, the installation/tmp directory may end up being unwritable through PHP. If BRS detects this situation, it will show you the page above.
You can fix the problem by giving the installation/tmp directory 0777 permissions using FTP, SFTP, or your host's control panel's file management interface.