Samsung has a nice ssd migration tool.
It will copy your "C" drive to one of their ssd's.
In the event that your new ssd will not hold the entire content of your current 2tb sshd, you can selectively exclude folders from the transfer, and they will still be readable when you reattach the 2tb drive.
If you do not have room to migrate apps such as games, they will need to be reinstalled. I understand that steam has a procedure to handle this, but I am no expert there.
Download the pdf manual of the Samsung ssd migration tool for details.