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1. An uninstall of Tableau Server is a mandatory step in the upgrade process. Uninstall removes the server software (not your data) and so you will keep existing data connections and workbooks in the new version.
2. If you want to import existing data connections and workbooks into a fresh install of Tableau Server you can first backup the data from the source installation of Tableau Server and then restore the .tsbak file into the target (fresh) installation of Tableau Server.
The following should help:
Perfect thank you.