DeltaCopy is an open source, fast incremental backup program.A normal file copy would copy the entire file even if a few bytes have changed. DeltaCopy, on the other hand, would only copy the part of file that has actually been modified. This reduces that data transfer to just a small fraction of 500 MB saving time and network bandwidth.

DeltaCopy Features:
1. Incremental backup:
Copies part of the file that is actually modified
2. Task scheduler:
Profiles in DeltaCopy can run based on a schedule
3. Email notification:
Administrators can receive email confirmation on successful as well as failed transfers
4. One-click restore:
Backed up files can be easily restored.
5. Windows friendly environment:
No need to manually modify configuration files or play around with command line options.

The license of this software is Freeware, you can free download and free use this data backup software.