Cloning a drive can be done without making a separate system image and allows the user to create partitions on the second drive in order to limit what space is used for the clone.
In addition to full backup the program supports differential and incremental backup. And merging of incremental backups can be done via the command line.
The backup process can be canceled or it can automatically pause if it encounters an issue (like the destination not having enough space for the backup), but there's no way to pause the process manually.