If you wanted a copy of your original file you could select the check box "Run preprocessing script on all messages received" in order to read the file and write it out to a local file.
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If you just wanted a copy of each message, you can have as many destination nodes as you like. This means that you can have a destination of a file folder connected directly to your source node. That destination does not require any mappings happen first so you can have a copy of your
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