Two physical SSD drives and one Time Machine backup
I am about to upgrade my MacBook, which has a single 500 GB SSD, and I need more space ASAP. I bought that drive in 2013.
I would love to get a new, fast 1T SSD, but don't have the cash, and am considering using the CD drive on my MacBook for a second 500 GB SSD.
But how does this work with Time Machine?
I love to be able to plug in an external backup drive and know that when that external drive is unmounted, it contains all the latest files.
What about if I had two physical drives?
How does Time Machine solve this new wrinkle?