Hello everyone, Recently I got myself a retina MacBook Pro and because of the capacity of the SSD I am using an external hard drive for a large amount of files that I don't need access to every day. So, I have three hard drives in total: the SSD in the MBP, one external Time Machine hard drive and one external data hard drive. In the Time Machine preferences, I have included my external data hard drive in the backup. However, each time Time Machine backups while the data hard drive is not connected, the next time TM starts working it starts copying the whole data hard drive again. Is there a way to fix this issue? Anyone having experienced the same problem? Thanks!