Well I can't seem to get a straight answer from support either so hence the question.
Did not want to waste a extra $100.00 for nothing.
And did not want to start over copying files.
I am assuming I can add a 2tb drive. using the mirror option.
Then down the road replace the system 1tb drive with a 2tb drive and all will be good without any lost files or storage space.

Blue Man Group
There is no such thing as stupid questions. Just stupid answers