What is your current configuration for the drives? Straight drives? No RAID setup?
I would be thinking RAID 5 configuration with the current drives you have. This would give your system redundancy if any single HDD crashing.
Beyond that, assuming you want to back up the entire content whole-sale, no other option than good old tape backup.
http://en.wikipedia.org/wiki/Standard_RAID_levels
http://en.wikipedia.org/wiki/Backup





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