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As mentioned on the original thread, we upload the file uploads to Amazon AWS, however we have several datacenters that are holding the same data through the replication setup.
All of the data is stored under an account with encrypted access - although the submitted data and the files are not encrypted themselves.
If you are however looking for such option there is an Encrypted forms feature that you can read more about here: What are Encrypted Forms and how to use them as expert?
This means that the data is saved in the format that you wish (encrypted or non encrypted), but accessible only to you and people that you allow - and to us if so is requested.