Search Appliance
The following procedure uses System Replication to back up System-Wide settings, all profiles' settings, and all profiles' walk data from one machine to another. This could be used to set up a "hot backup" machine that automatically receives settings and data changes from a live machine. Once configured, during normal operations the backup machine will thus neither be further manually configured (e.g. profile settings changes), nor will it walk profiles, as it now automatically receives both from the main machine. If the main machine goes down, the backup can then be instantly swapped in as the live search, without waiting for restoration from backup or rewalks.