do you mind if I ask where you store the Arq backup? On a separate physical drive, in a cloud service, etc.?
I use B2 for cloud, and two NAS boxes on my network. I used to use OneDricd thanks to a legacy plan that was generous, but that appears to have stopped working for unknown reasons.
All data is encrypted with a paraphrase I supply, so short of some spectacular amount of brute force I consider it safe.