| 摘要 |
The present invention provides methods and an infrastructure for performing repetitive data protection and a corresponding restore of data for block oriented data objects comprising several indexed segments. For implementing the invention, timestamps tk are set by a timer k. Only the first data modification of a segment is recorded, after a timestamp tk has been set, by storing the old data contents of said segment together with the segment index j and said timestamp tk as undo-log block in a first journal j0, before overwriting said segment with the modified new data. Besides, said undo-log blocks are transmitted to N journals ji for storing redundant undo-log information, with N>1 and i=0, . . . , N-1. According to the present invention for each journal ji journal-specific timestamps tk/i are generated, so that each journal ji is written for a different set of timestamps tk/i.
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