Just upgraded my 1TB drive that I upgraded to last year to a 2TB WD SN740 as I wanted more space, upgrade went extremely smoothly. Plugged the new drive into the USB-C port, ran the clone command from the deck desktop, inserted the new drive and was up and running with no issues whatsoever. Took about 30 mins to clone my drive which was about 70% full and it copied everything perfectly and auto resized the partition, didn't even need to sign back steam
Clone command I used was,
sudo dd if=/dev/nvme0n1 of=/dev/sda oflag=sync bs=128M status=progress