1. A synchronization apparatus, comprising: a storage unit, stored with a plurality of policy sets; a network interface, electrically connected to a storage server via a network; and a processing unit, electrically connected to the storage unit and the network interface and configured to execute an operating system and execute an agent program installed on the operating system, the agent program configuring a first individual space and a second individual space within the storage unit, determining a context of the synchronization apparatus, selecting a first policy set and a second policy set from the policy sets for the first individual space and the second individual space according to the context respectively, and handling the first individual space and the second individual space according to the first policy set and the second policy set respectively; wherein the first individual space and the second individual space are only recognized by the agent program installed on the operating system, the first individual space and the second individual space are unaware of each other, the first policy set comprises a first rule regarding synchronization between the first individual space and the storage server, and the second policy set comprises a second rule regarding synchronization between the second individual space and the storage server.