https://confluence.atlassian.com/conf720/troubleshooting-failed-xml-site-backups-1168862248.html
Troubleshooting failed XML site backups | Atlassian Support | Atlassian Documentation
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https://support.atlassian.com/confluence/kb/restoring-confluence-xml-site-backups-fails-import-failed-check-your-server-logs/
Restoring Confluence XML site backups fails: Import failed. Check your server logs ... | Confluence...
Fix Confluence XML site backup restore errors by diagnosing malformed Server ID and updating the source database.
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