If you want to keep data from a computer, you don’t need to keep the actual hardware around. This gives you the flexibility to change back to any preferred configuration. 
You can make as many different images as you want. There’s no need to set up every computer separately or set up the whole operating system from scratch. There’s a lot of benefits to disk imaging, as noted by Dmitry Shesterin at. 
You can fill an empty disk image with data, then use it to create disks, CDs, or DVDs. In other words, it’s a file that contains other files and folders. A disk image (.dmg file) is a file that looks and acts like a mountable device or volume. Using the Disk Utility in macOS, you can create a blank disk image for storage.
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