This feature should only be present in the wizard if we can configure backup caches.
The cross site replication feature is only available in servers configuring cross site replication.

Use the REST API Calls to know the backups sites

https://infinispan.org/docs/stable/titles/rest/rest.html#rest_v2_cache_manager_site_status

Sites views: https://infinispan.org/docs/stable/titles/rest/rest.html#rest_v2_cache_manager_info