You can use the Disk Utility in macOS Sierra to create a disk image from a disk or a connected device. A disk image (.dmg file) is a file that looks and acts like a mountable device or volume.
With Disk Utility, you can create a disk image that includes the data and free space on a physical disk or connected device, such as a USB device. For example, if a USB device or volume is 80GB with 10GB of data, the disk image will be 80 GB in size and include data and free space. You can then restore that disk image to another volume. Here’s how:
Disk Utility creates the disk image file where you saved it in the Finder and mounts its disk icon on your desktop and in the Finder sidebar.
A word of warning: don’t create a disk image of a disk that you believe to be failing or that contains corrupted information. The disk image may not serve as a reliable backup.
(This how-to is based on my experiences and info on Apple’s support pages — where the images sometimes come from.)
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