scp for most everything I control.
I just read Lopp's article (from 2020), ... might give one or two of them a try.
How to Securely Back Up Data to Cloud Storage https://blog.lopp.net/how-to-securely-back-up-data-to-cloud-storage
The article is useful, but it is more about how to encrypt data in the cloud, not about transferring files to other users. But it is good information
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