At TransferXL we believe that you as the user have to be in control of your transfers. That is why we give you to control over pretty much all aspects of your transfers.
If you want to protect any sensitive or confidential information that you are sending, encrypt your transfers.
Download only what you need in case you do not need that full mega transfer. Or if you forgot to upload something, just add it to the transfer.
With this we think that you are in control of your transfers. Let us know if we have missed anything?