I have searched all over and cannot find an answer to this question: It seems like whenever my MBP is plugged up to my USB hub (which also houses my Time Machine drive), Time Machine is CONSTANTLY backing up. It's almost like it runs for like 50-80GB then stops for a few minutes, and then re-starts again. Is this normal? Should Time Machine be almost consistently backing up like this or am I missing some setting somewhere that would prevent this? I looked in Time Machine preferences and did not see anything relating to consistency of the backup. Thanks!