Russ,

It's not sure at all that the delete of the trial version will delete the data made with it also. Generally, they stay, although I'm not sure this is the case with this beta.

However, they surely are on your backup. And I'm rather sure the trial version can read the data from the beta version. So even if they disappear during the process, you should still be able to restore them from the backup.
If you don't have a backup of a few months of data, it's time to make one first.

Hope this helps.


Kees