Iperius Backup - freeware + portable

Iperius Backup Free

Iperius Backup is a backup software freeware for Windows.

The freeware edition is fully portable. It could be included in PortableApps.

Official website: http://www.iperiusbackup.com

Main Features:

Backup to mass storage devices: NAS, RDX, USB, etc.
Incremental backup
Zip compression
Scheduler
Email notifications
Works with Windows Server
Execution of external programs