Just tested a backup on 1.14.4 and it succeeded as expected. Updated to 1.14.7 and saw the issues as described above.
This is happening to me as well with the latest version.
FWIW I updated the latest ca-bundle.crt and uploaded it to wordpress/wp-includes/certificates without any change in behavior.
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This reply was modified 8 years, 1 month ago by thelambeers.