Backup Exec large-size backups

Hello there,

We are now using Backup Exec to back up our SQL server databases, but it is always bothering us by taking large-size backups. Sometimes full backups are 30 GB but incremental backups are 40 GB.!!!!!

First: Do you know why it happens?

Next, we are now considering to use SQL Server Management Studio instead of Backup Exec to backup. 

Do you think SQL server can work as well as Backup Exec?

Thanks in advance

PS: We need a centralized backup storage and notification board!!!