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A better way to mirror the disk is to use Tiger’s “Disk Utility” to set up a RAID system. Then the mirroring will be done in real time. Data will be written once to each drive. Reads can be done round robin and may pick up some performance from parallelism. The best part is that the system will not crash if a disk fails and you can continue runnig on one less drive until you can swap out the drive. Even with a mirror you stil need daily snapshots and offsite storage
http://docs.info.apple.com/article.html?path=DiskUtility/10.5/en/duh1013.html