Phil, As a specific example for DR, as per Geoff's description, our primary hosts are in a datacentre in NSW. We also pay for a lower-spec server in QLD for DR. We use the VPS software to periodically clone the primary server to the DR server via incremental snapshots. A script at the VPS host also applies critical changes to the clone (ID, IP etc).
In the event of a catastrophic failure in NSW, we boot the DR server (manual) and point primary DNS to the DR server (manual). Depending on the scenario, key clients may be informed of a temporary URL (while waiting for DNS to be resolved) and/or the DR sever may be put into a read-only mode (at application layer). This ensures our customers (enterprises) can access their data in a degraded mode while we migrate to a new data centre (from backup, or a snapshot of the DR server, manual). We would only initiate the process in *really* bad scenarios which we try to anticipate in a DRP/BCP (large enterprises generally require that you have a plan). We also try to ensure that more than one person knows how to make that migration. cheers, Jeromy Evans
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