Cloning
Entire storage volumes or individual drives can be cloned, which in turn can be used instead of the originals. With this function you will generate clones from storage volumes or individual drives including the information on the hard disk layout with all data stored on it. You do, however, require a lot more storage space for a clone than for an image.
Unlike images, there are no incremental or differential clones possible for reducing the data volume of successive clones. In addition, a clone cannot be compressed or encrypted compared to an image.
More: