My Book Live using 25% of my CPU

Hello Normskii, Smartware uses the active process (WDBackupEngine.exe) when your computer is being scanned. You can change the backup type from continuous to daily. Se below for more information. 

How to create a Scheduled Backup with WD SmartWare 2.0 or WD SmartWare Pro

http://wdc.custhelp.com/app/answers/detail/a_id/9883