Embodiments of the present disclosure relate to a method and device for migrating data. The method comprises identifying cold data in a primary storage system. The method further comprises, in response to determining that the cold data is in a non-compression state, obtaining the cold data from the primary storage system via a first interface, the first interface being configured for a user to access the primary storage system. The method further comprises obtaining, in response to determining the cold data is in a compression state, the cold data in the compression state from the primary storage system via a second interface that is different from the first interface. The method further comprises migrating the obtained cold data from the primary storage system to a secondary storage system.