Fix upload stall error introduced with S3 throttle #299
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A
break
statement was accidentally unindented one leveltoo far, introducing a bug when looking for multipart
upload ids. Sorry for that :)
It led to multipart chunks being missed and the overall
upload never finishing. Throw an error in case the multipart
upload is not found on S3 anymore, for example due to
manual aborts with the AWS CLI tool.
In these cases the backup could hang forever, too.
Also: Increase the number of callbacks for throttling,
because on very fast connections the previous block
size of 2MB was to coarse.