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If your moving data to a remote site over optical fiber, then the cables themselves are fairly secure since it's quite hard to tap optical cables without anyone not knowing about it.
For remote backup using TCP/IP, you can use compression on either end to somewhat scramble the data or you could use iFCP-based SAN extenders which will allow you to use any security measures that are available for TCP/IP. If it were my data though, I would use an encryption engine on both sides of the pipe just to be certain. This could either be an appliance or a software solution.
Since you are moving data to a remote location, zoning in the SAN will not help you. You need to focus on the TCP/IP portion. Have your customer use dedicated leased lines, use encryption and use optical connections if you can afford it.
Chris
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