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Proper IT systems for an organisation of BA/IAG's size should have had multiple, geographically separate, data-centres (in secret locations), each with multi-tier surge protection, each server having multiple redundant power supplies (each connected to separate UPS units) and multiple redundant processors and memory (RAID disks goes without saying these days), fully automatic database synchronisation (aka replication), routers and network switches also having battery backup or UPS units, all set up with automatic fail-over so that only if all servers in all data-centres failed completely simultaneously (probability of nil) could their entire computer system fail.