How to: Create a system image in Windows 10
First step, launch Backup and Restore
Press Windows + X then click Control Panel
In Control Panel, click Backup and Restore (Windows 7)
Under Control Panel Home, click Create a system image
Make sure your external storage device is plugged in and turned on. It should automatically be detected. Click Next
Click Start backup to begin the backup process. The process can take some time depending on the size of your backup.
Backing up Windows 10
After Backup has completed you can close the wizard or create a system repair disc. It is recommended you do so if you don’t have a physical copy of Windows 10 for reinstallation.