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Credentials are correct, a file is sent to the cloudserver, but it is 0KB in size, backup is 66MB.
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The same happens on other sites using Akeeba.
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Akeeba reports no errors and says backup went ok.
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Your suggestions are more than welcome...
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debug log mentions nothing...
it contains some comments and two lines
--- START OF RAW LOG --
--- END OF RAW LOG ---