Assuming that you meant the host is completely dead when you said crash, i suggest you refer this GUI utility to backup your configuration and restore it.
so when a host is dead beyond recovery you just reinstall it, restore the configuration back to the host using this GUI and add it to the vcenter .even if u dont backup any configuration all u r doing is reinstalling it,
configure vswitches,
configure connections to the storage
add it to vcenter
OR
use that gui utility and back up your configs time to time,
prevention is better than cure