Based on the list of contenders feels like you might be missing rsync.net?
By itself rsync.net doesn't support S3. The one I wrote (Filestash) lets you use rsync.net as a downstream storage and proxies it through the S3 protocol.
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By itself rsync.net doesn't support S3. The one I wrote (Filestash) lets you use rsync.net as a downstream storage and proxies it through the S3 protocol.