Feature suggestion: ignore if downloaded

[wamatt]

Might be nice to allow option to not ignore existing files. This way one can run the script idempotently, and only new files will be added.

A nice side effect is it save bandwidth, keeps file dates in chronological order (like if you're running a daily chron job), and also doesn't trigger any file watching logic on the OS side.

[jamesridgway]

Please feel free to raise a pull request to add this feature :)

[github-actions[bot]]

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