We don’t recommend connecting your Apple Time Machine backup drive to your Kwilt device for the following reasons: 1) Your Apple Time Machine backup is formatted in a proprietary format and Kwilt cannot read its content, and 2) you will no longer be able to back up your Mac to your Time Machine backup drive when it is connected to Kwilt.
We recommend having a dedicated drive for your Time Machine backup directly connected to your Mac, and another one dedicated to Kwilt so that you can store and access all your photos from anywhere.