Hello Agonzalez
Make sure that the backup job indeed backs up the transaction logs, and clears unused entries, and shrinks the transaction log
I'm no be expert, but you should be able to figure it out. As an FYI, we have our transactionlogs backed up every 15 minutes in sql... The backup-files are transferred to a shared disk, where actual backup takes them, and deletes them.
gertjan
Regards. Gertjan