The error message "Unable to create the remote backup: (1): expected value" indicates an issue with the configuration or authentication when trying to create a remote backup to Dropbox in Plesk Obsidian.

To address this issue, you can follow these steps:

1. Check Dropbox Authentication:

   • Verify that the Dropbox account linked to Plesk for remote backups is correctly authenticated. Re-authenticate if necessary.

2. Reconfigure Dropbox Backup Settings:

   • In Plesk, go to "Tools & Settings" > "Backup Manager" > "Remote Storage Settings". Reconfigure the Dropbox backup settings, making sure to follow any authentication prompts.

3. Check API Token:

   • Ensure that the API token used to connect Plesk with Dropbox is valid and has the necessary permissions to access and modify files. If the token has expired or been revoked, you might need to generate a new one.

4. Check for Special Characters in Paths:

   • Ensure that there are no special characters or non-standard symbols in the file paths, backup names, or any other configurations related to the backup process. This can sometimes cause issues.

5. Verify Internet Connectivity:

   • Confirm that your server has stable internet connectivity and that there are no network issues preventing communication with Dropbox.

6. Review Plesk Logs:

   • Check the Plesk logs (located in /var/log/plesk/) for any specific error messages related to the remote backup process. These logs may provide more context about the issue.

7. Update Plesk:

   • Ensure that your Plesk installation is up-to-date. If the issue is related to a bug in the software, updating to the latest version may resolve it.

8. Check for Dropbox Service Outages:

   • Sometimes, remote services like Dropbox may experience temporary outages. Verify that Dropbox services are running without any reported issues.

9. Contact Plesk Support:

   • If none of the above steps resolve the issue, consider reaching out to Plesk support for further assistance. They can provide specific guidance based on your server's configuration.

By following these steps, you should be able to resolve the issue and successfully create remote backups to Dropbox in Plesk Obsidian. Remember to always back up your data before making significant changes or updates to ensure you can revert to a stable state if needed.