7. The non-transitory computer-readable storage medium of claim 6 , wherein generating the sketch further comprises: generating a set of features for the selected data chunk.
7. The non-transitory computer-readable storage medium of claim 6 , wherein generating the sketch further comprises: generating a set of features for the selected data chunk. 8. The non-transitory computer-readable storage medium of claim 7 , wherein searching for the set of candidate data chunks further comprises: searching an index of data chunks to identify the set of candidate data chunks by comparing features in the index with the set of features of the selected data chunk.