MacBook Pro, OS X Mountain Lion (10.8.5) I have a 100GB primary backed up via TM to a 150GB partition on an external hard drive, 30GB remains in the partition. To make a 2nd TM backup to another external hard drive, can I just do a straight copy from the existing TM partition to the new drive? Repeating the standard TM steps, the backup is so slow. Also, what is involved if I want to make the new TM partition 200GB? Shouldn't make a difference if the partition size is bigger? Thanks in advance.