You could have downloaded DualBackup 2.0 from our software library for free. The software is included in System Utilities. The DualBackup installer is commonly called DualBackup.exe. The most popular version among the software users is 2.0. Our antivirus analysis shows that this download is virus free. This free software was originally designed by Agistar Technologies LLC.
From the developer:
DualBackup is a free backup software that allows you to encrypt and back up your files to external hard drive, network drive, thumb drive, CD or DVD. At the first backup session, all files are backed up. After that, only new files or changed files are backed up. In the incremental backup, only changed blocks of a file is copied to backup destinations.
You may want to check out more software, such as LxCopy, iUnformat or vRanger Professional, which might be similar to DualBackup.