Start by checking your network connection using the following URL: https://s3-accelerate-speedtest.s3-accelerate.amazonaws.com/en/accelerate-speed-comparsion.html
More info would be helpful in understanding your use case. Such as OS, size of files, number of files, what kind of backup software you’re using.
Also: Network type (Internet, Direct Connect); network bandwidth; latency to region - other good things to know.
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