storage method; storage instructions
Refers to how something should be stored, often used for food, medicine, or other items requiring specific conditions.
Please read the storage instructions for this food carefully.
If you follow the proper storage method, it will last longer.
保存 is the general act of preserving or storing; 保存方法 specifies the method or instructions for doing so.
保管方法 is similar but often implies safekeeping or custody, while 保存方法 focuses on preservation conditions.
Compound of 保存 (preservation, storage) and 方法 (method, way).