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If you're wanting to do realtime backups, the amount of bandwidth that you would need to send the info to a storage center would be quite high. You would easily exceed the bandwidth at which the drives could handle. You might be able to setup a script that would tell whatever happens on one server to replicate it to the storage system, either overwriting the existing file or saving it under a different name. The storage system though is for sure going to have to have redundancy.
I see you looking to buy SCSI 15k drives, fibrechannel (connectors, fibrechannel switch, etc.), something at least 4U chassis to handle the drives.
Nightly backups? Thats easy.
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"You hear the one about the fella who died, went to the pearly gates? St. Peter let him in. Sees a guy in a suit making a closing argument. Says, "Who's that?" St. Peter says, "Oh, that's God. Thinks he's Denny Crane."
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