Your new Hitachi 2Tb HDD has been formatted?
Mac OS Extended (Journaled)?
You selected the HDD in Time Machine Preferences as your TM backup HHD?
It made a complete copy of you MBP files? (This probably took a long time - depending on the amount of data you have)
It now is coping all of your internal HDD data again, or is it simply doing a normal backup?
Do you have windows on your MBP?