Traceable
Moving your data using airliners, third party couriers, trusted employees etc., imposes a very basic danger: losing the device in between transporting hubs, whether due to accident, wrongdoing, or even heavy weather conditions that may result to having the device stacked somewhere on the back of a truck, a train wagon or a ship container for weeks… Even worse, in the case of wrongdoing, even if your data is heavily encrypted it is essential to know if there is someone trying to take a copy of it, as well as the exact whereabouts of the device in order to engage law enforcement. Yes, your data may be encrypted, but can you be 100% certain that the encryption passphrase was not stolen as part of an "inside job"? That is why tracking your data, knowing and verifying the Chain-of-Custody and understanding what happens to the device while on transit is crucial.