I'm doing Site Backup but the following error appears, please help :
In general we steer people away from using the XML backup in Confluence. Everything you need to do is better done with a native db backup tool, except for migrating to a new database. Upgrading doesn't need it, backing up is more reliable using a native backup tool, and even moving to a new server is better done using a db dump.
All that is described in the XML Backups Troubleshooing, the parent knowledge base article.
Having said all that, you can indeed troubleshoot the XML backup (we just think it's not a good strategy; the XML backup is not reliable and it's time to change your backup strategy). From your stack trace, this is the line to focus on:
net.sf.hibernate.ObjectNotFoundException: No row with the given identifier exists: 18776102
The knowledge base article for this is Cannot Create XML Backup Due to ObjectNotFoundException No Row with Given Identifier. Notice the warning at the top...
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