Restoring from a backup put the settings and data back on Tableau Server. Restoring with --no-config restores (per the Restore from a Backup article) "only the data but no configuration settings". If no data was restored using --no-config, it sounds like the restore process wasn't successful at all. I would suggest trying again. Did you receive an error messages? The Tabadmin.log file may contain some valuable information as well.
Hope this helps!
No. It said it was successful.but i don't see any data sources in the new version