Hydrolysis of terminal non-reducing beta-D-fructofuranoside residues in beta-D-fructofuranosides. Glycan biosynthesis; sucrose metabolism. May be present in two forms, a 70 kDa monomer and a heterodimer of the 30 kDa and 38 kDa subunits. The ratio of the levels of the two forms within cells appears to be regulated developmentally (By similarity). May be released into the lumen of the vacuole from the tonoplast through a proteolytic processing. Belongs to the glycosyl hydrolase 32 family.