Zachary Peterson writes: "Ext3cow, an open-source versioning file system based on ext3, has been released for 2.6 kernel. Ext3cow allows users to view their file system as it appeared at any point in time through a natural, time-shifiting interface. This is can be very useful for preventing data loss, revision control, intrusion detection, and meeting the requirments of data retention legislation. Kernel patches and details can be found at: http://www.ext3cow.com./"
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