Backup Agent supports the following types of backups:

• Database full backup .   Backs up the entire database including the transaction log .
• Database differential backup. Backs up the new added or modified data since last full backup. A full database backup is required before you perform a differential backup . 
• Transaction log backup . Backs up the transaction log files of a database .  By creating transaction log backups, a database can be restored to any point in time contained within the sequence of transaction logs, right up to the point of failure .
  Note : If the database recovery modal is "Simple" , it can do transaction log backup on this database.  

When a Full Backup Is Required
When to Perform a Differential Backup
Creating transaction log backups