To get list of full backup from Oracle database run the script below, which uses the rman_backup_job_details system view, this list all backups in database with archivelog mode on and backup size of at least 1 Terabyte.
SELECT * FROM v$rman_backup_job_details
WHERE input_type = 'DB INCR'
AND output_bytes_display LIKE '%T'
ORDER BY session_key DESC;