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There are a few hardware raid solutions that would mirror the drives if one fails. he other option is to manually copy the drives periodically, but of course you are always at risk of losing the recordings since the last copy. The hardware RAID solution must look like a single drive to the DVR, with no additional software/drivers required. Many of the less expensive RAID enclosures actually are done through software in the OS, which is not possible with thw closed OS of the current DVR's.