More information can be found here:
How it works, is we load a driver at the time of windows start up. It is at the disk Filter level (alot like antivirus) So when you do a backup, i filters the changes that would have gone to the hard drive, and places them in a "cache" area. At the end of the backup, it then applies the changes to the hard drive.
It does not interfere with any other running software.
If you have any questions please let me know.