Macrium Reflect is described as 'Securely backup data, clone and image disks using local, network, or USB drives with a subscription model accommodating personal and commercial needs' and is a very popular Disk Cloning tool in the backup & sync category. There are more than 50 alternatives to Macrium Reflect for a variety of platforms, including Windows, Linux, Mac, Android and iPhone apps. The best Macrium Reflect alternative is Clonezilla, which is both free and Open Source. Other great apps like Macrium Reflect are Rescuezilla, Duplicati, Acronis True Image and AOMEI Backupper.
This is a bootable Linux tool. Macrium does more stuff such as daily "diff" images of a running Windows install to a network drive. Totally different tools.