So I have a 13" rMBP that backs up all of it's contents to a Time Capsule. I also have an external 1TB HDD that has files I cannot fit on my MBP's small 128GB SSD. I'd like Time Machine to backup BOTH my rMBP's drive and the external drive to the Time Capsule. This can happen by removing the external drive from Time Machine's exclude list, but there's a catch.. If the external is not connected, Time Machine backs up just the rMBP and then the next time the external is connected, Time Machine backs up the entire external drive to the Time Capsule again (likely because it did not find it in the most recent backup)! Any idea of a better way to backup a Mac+External drive to a Time Capsule when the external isn't always plugged in to the Mac?