The XML you provided was not well-formed or did not validate against our published schema.

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How to troubleshoot the following BACKUP DATABASE error:

ERROR 2205 (HY000): Backup subprocess nonzero exit value. MalformedACLError: The XML you provided was not well-formed or did not validate against our published schema.

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Receiving a MalformedACLError error after attempting to Backup to an S3 Compatible Storage Provider generally means the storage provider doesn't support part of the full S3 API.

Troubleshooting Steps

• Specify "compatibility_mode": true in the configuration_json in the  BACKUP DATABASE command.
  For example:
  

  BACKUP DATABASE test_db TO S3 "my_storage"
  CONFIG
  '{"compatibility_mode":true, "endpoint_url": "http://my.storage.com"}'
  CREDENTIALS
  '{"aws_access_key_id": "xxxxxxxxxxxxxxxxxx",
  "aws_secret_access_key": "xxxxxxxxxxxxxxxxxxxx"
  }'

• Confirm you are following the syntax as provided in the Backup to an S3 Compatible Storage Provider documentation.
• To use the compatibility_mode setting in the backup database command you must be on SingleStore version 6.8.16 or higher.

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