Hydrolysis of cellobiose from the reducing end of xyloglucans consisting of a beta-(1->4)-linked glucan carrying alpha-D-xylosyl groups on O-6 of the glucose residues. To be a substrate, the first residue must be unsubstituted, the second residue may bear a xylosyl group, whether further glycosylated or not, and the third residue, which becomes the new terminus by the action of the enzyme, is preferably xylosylated, but this xylose residue must not be further substituted. Optimum pH is 3.5-5.0 with the oligoxyloglucan heptasaccharide XXXG as a substrate. Over 90% activity is retained between pH 4.8 and 8.0. Optimum temperature is 50-60 degrees Celsius with the oligoxyloglucan heptasaccharide XXXG as a substrate. Belongs to the glycosyl hydrolase 74 family.