13. The method of claim 1 further comprising obtaining a further input segment from the volume of data and repeating, with respect to the further input segment, said acts of comparing each of a plurality of overlapping portions, comparing selected bytes and replacing with a token representative of the dictionary segment.
13. The method of claim 1 further comprising obtaining a further input segment from the volume of data and repeating, with respect to the further input segment, said acts of comparing each of a plurality of overlapping portions, comparing selected bytes and replacing with a token representative of the dictionary segment. 14. The method of claim 13 wherein repeating, with respect to the further input segment, said acts of comparing each a plurality of overlapping portions, comparing selected bytes comprises repeating said acts of comparing each a plurality of overlapping portions and comparing selected bytes using a smaller selected portion of the input segment than in preceding acts of comparing each a plurality of overlapping portions and comparing selected bytes.