In a method for storing security relevant data in a postage meter the same data (A, B, C, D) are stored in at least four memory areas (a, b, c, d). The data (A, B, C, D) of each memory area (a, b, c, d) are compared with the data (A, B, C, D) of other memory areas (a, b, c, d). In dependence on these comparisons (V1 to V6) the memory area or memory areas (a, b, c, d) having faulty data (A, B, C, D) are ascertained and if suitable are reloaded with data (A, B, C, D) from a memory area (a, b, c, d) with fault free data. The method operates at small expense and can correct the ascertained data faults.