SQL backup question

I have report server that needs to be updated each night from a backup of the source server. If I run a backup with the following settings:
BACKUP LOG NGProd WITH TRUNCATE_ONLY
DUMP DATABASE Prod TO Prod_reportserver WITH INIT
at say 9:00 pm,
which basically uses a dump log file on the report server to backup to and then I also run a another full backup at say 1:00 am that I would like my transaction log backups to get back into sync with on the source server (meaning my problem is that once I do a full backup and send that to another server, my subsequent transaction log backups are now syncing with this backup so I run another full backup later that stays on the source server)that has the following steps:

BACKUP DATABASE [Prod] TO  DISK 'E:\MSSQL\Backups\Prod\Prod_backup_200911090950.bak' WITH NOFORMAT, NOINIT,

which should allow me to then start running my transaction log backups on the source server at the start of business which would be in sync with the second full backup I did which is also the one that is kept on the source server and not backed up across the network. Thanks