Hello Shivani,
Welcome to Atlassian Community. It's nice to have you!
I want to suggest that you may be able to migrate to Cloud using the Confluence Cloud Migration Assistant. Please also refer to the Cloud Migration Portal. We have a special migrations support team that can help you if you are getting stuck while migrating to Cloud.
To address the 504 error, the most common reason for backup to fail over the web UI is proxy timeout. Proxy timeout kills the connection because it causes Confluence to appear not to respond.
Another reason it can fail is the size of the Confluence site. Native XML backup is not very reliable for large instances (thousands of pages and spaces).
You can check the Confluence Server log (atlassian-confluence.log). The log will tell you if backups ran or if they failed for any specific reason. If you're not finding any failures, perhaps the job didn't fail, and it continued to run in the background over some time. I would then recommend having a look at your backup directory after the automatic backup attempted to run. At times, Confluence initiated the backup successfully, in which case you can find the file in your backup directory. See Configuring Backups to learn where you can find that directory.
I hope that helps, but let me know if you have any additional questions!
Take care,
Shannon
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