SQL Server 2000 and Truncated Logs

Hello,

I know that incremental backup will backup transaction logs from SQL server. My question is about the option -T and -G with full backups:
The Full backup copies the transaction log? With the option -G and -T with the full backup I could get the transaction log copied and truncated?
How do you manage full SQL backups with transaction logs. Do you truncate them after the backup with these options..

Thanks in Advance.