Deprecated function: session_set_save_handler(): Providing individual callbacks instead of an object implementing SessionHandlerInterface is deprecated in drupal_session_initialize() (line 245 of includes/session.inc).
Deprecated function: Creation of dynamic property alpha_theme_container::$delta is deprecated in alpha_theme_container->__construct() (line 25 of sites/all/themes/contrib/omega/alpha/includes/base.inc).
(2) Will BackDrop CMS - the fork of Drupal 7 - be a viable alternative to Drupal 8 or will it fail? What factors will determine its success or failure? - Quora