Likely nothing’s perfect. S3 as mentioned by @Pectojin is probably the most recent protocol and code. Duplicati uses Amazon’s client. I don’t know how well Minio does, but https://forum.duplicati.com/search?q=minio seems to find more questions than complaints. One post that might be useful is this:
Setting up self-hosted Minio on Windows 10 with automatically renewing SSL certificate