Patent ID: 8015155

Claim:
A computer program product for backing up a dataset comprising a first plurality of blocks, said computer program product comprising: a computer readable medium; first program instructions to read an input image copy of said dataset, wherein said input image copy is prior to a start of a reorganization of said dataset; second program instructions to determine a cursor value of a cursor associated with reorganization of said dataset, said dataset being a source dataset, said cursor value indicating a second plurality of blocks of said first plurality of blocks that have been moved from said source dataset to said target dataset, wherein said second plurality of blocks is a subset of said first plurality of blocks; third program instructions to produce a backup copy of said dataset based on said input image copy, a log comprising changes to said dataset, and said cursor value; said backup copy comprising said cursor, said second plurality of blocks, and blocks of said first plurality of blocks that have not been moved to said target dataset; and wherein said first, second and third program instructions are stored on said computer readable medium.