So my current external Time machine backup hardrive which is connected to the USB port on the Apple Time Capsule is full (and so is the internal hard drive of the Time capsule as well). So I want to use the new hard drive with the time capsule, right now I have both the old full external HD and the new external HD connected to the TC USB port through a powered USB hub (since the Time Capsule only has 1 USB port). My MacBook Pro and Time Machine is recognising both external hard drives So how can I continue to use the new hard drive, meaning so that it will only backup new changes on the computer? I guess normally if I choose to use the new hard drive in Time machine settings it will backup the whole computer since its a empty hard drive, but I don't want it to do that since it will take up a lot of space. I just want it to continue from the old external TM hard drive, so it only backups changes made since the last backup on the old HD. How do i do that? Haven't really tried anything yet. I guess I will have to get the TM to recognise both connected drives as 1 single drive, or how does it work?