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Block-level Continuous Data Protection (CDP) logs every disk block update so that disk updates within a time window are undoable. Standard file servers and DBMS servers can enjoy the data protection service offered by block-level CDP without any modification. Unfortunately, no existing block level CDP systems can provide users a file versioning view on top of the block versions they maintain. As a result, the data they maintain cannot be used as an extension to the on-line system with which users routinely interact.
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