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I think you can encrypt communication using SSL protocol. Here's a link to refer to for more details
As for refreshing extract for Tableau Online, you can use Tableau Bridge. You can get a lot of information online. Here's something to start
Thanks for the info, it has been really usefull
Am glad it helped. Can you please mark the answer Helpful/Correct as appropriate and close the thread. So others can also refer to the links as needed. Thanks.