Two durable recording methods for magneto-optic images in ferromagnetic thin films (82% Ni-Fe permalloy) are described. Method one, carried out in a vacuum, applied the sinusoidal shape magnetic field generated from audio tape at the stage of preparation of the ferromagnetic film. The stripe image recorded in this way has remained for a period of more than two years and the phenomena can be explained by the magnetic evaporation effect theory. The other durable recording method, performed in air, used the same patterned magnetic field as above and the durability of the recording has been confirmed for more than nine months even after application of an external erasing magnetic field of 100 times as large as the coercive force of the thin film. This recording procedure is performed within a week because an effective period is required to fix the direction of magnetization. Statistical estimations give a storage period of about 11 years and at the optimum thickness, the records could be stored for about 110 years. This is the description of a feasibility study to determine the suitability of magneto-optic recording for durable preservation of records. -- AATA