PJAZ - no you wont lose any data on your laptop. When I upgraded from my 301 to the 405 all thats required to do in Training Centre is add a new device from the drop down menu User > Add New Device and you new data will be included.
As Danowat has said, backup your data just in case your laptop dies, so you have your history if you need to rebuild anytime, I do mine weekly.
Comments
You shouldn't do, the old data should still be in the GTC (Which I assume you use to view your data).
To be on the safe side, you could backup your current data just in case.
PJAZ - no you wont lose any data on your laptop. When I upgraded from my 301 to the 405 all thats required to do in Training Centre is add a new device from the drop down menu User > Add New Device and you new data will be included.
As Danowat has said, backup your data just in case your laptop dies, so you have your history if you need to rebuild anytime, I do mine weekly.