RAID 1 is probably the best solution. It will make two copies of everything. You could even do FireWire as most decent Firewire drives will have two ports—one to connect to the computer and one for the camera.
In my experience 80% of the calls I've received from photographers who lost something from a shoot were from photographers who had accidentally deleted, formatted, or overwritten their files/folder or had lost them due to software corruption or other software issue (e.g. didn't know they were in a mode that didn't save the images). Only 20% have been due to hardware failure. These are rough numbers obviously.
RAID 1 would duplicate the deletion/formatting/overwritting/corruption of a file on the second disk in real time.
So the vast majority of the people who called me would have been equally hosed had they been using RAID 1 and would have been saved if they were using a sync-without-delete method as I've described above.
The numbers are so one-sided that I actually actively recommend *against* RAID 1 as it leads to a false sense of security that your shoot is safe.
Doug Peterson (e-mail Me)
Head of Technical Services, Capture Integration
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