Import failed. Check your server logs for more information. com.atlassian.confluence.importexport.ImportExportException: Unable to complete import because the data does not match the constraints in the Confluence schema. Cause: PSQLException: ERROR: duplicate key value violates unique constraint "unq_lwr_username" Detail: Key (lower_username)=() already exists.
This should help you work through this issue. https://confluence.atlassian.com/confkb/confluence-site-xml-import-fails-with-duplicate-key-error-438993638.html
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Does the instance that you are importing from still exist? If you could validate that no duplicates exist in the database and then perform the backup again.
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