It is a Linux app that runs from a bootable flash drive. All you have to do is choose the source and destination drives for the backup, and it does the rest.
It looks like a good one! My problem is that I have been making backup images for years with free versions of Macrum Reflect which is included in Hiren’s Boot CD. These images are accessible over the network after booting from Hiren’s. So, at this point it is much easier for me to stick with my current system.