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