Hi Guys After I got swift help with a problem that TM did not fully backup my MBA+ ExHDD I thought somebody also can help me with the opposite This morning after 22h TM finished a 650GB backup. 53GB from MBA + 550GB of ExHDD to a 2TB Timecapsule. I did disconnected the HDD and went to work. As I came back and in reach of the wifi network TM started a automatic backup. Even so I haven't used the MBA, TM still made a full 53GB backup. I was under the impression TM only backs up changes. Is a not connected ExHDD regarded as a change? and why does the backup continues even the HDD is connected in the meantime?? Any explanation and help welcome!