Windows 10 Backup, Restore, Recover Options
There are a few Windows 10 backup options and they are a bit confusing. Some will work with a USB, while some will not.
Create a System Image: Windows 10 Image Backup
This option backs up your disk exactly as you have it. It takes the largest amount of space. I culled my Win 10 disk down to 51G and when I tried to create a system image it asked me for a disk no less than 72G! Also, this option will not let you use a USB key, so you’ll need a new disk. I had to format the USB key to NTFS, then used these instructions to create a network drive, on my Win 10 laptop, in order to trick it into accepting a USB key. In the end my 64G USB key was too small because Win 10 wanted 71G minimum.