As mentioned, ISO files can be stored on DVDs, and by ripping these DVDs, you can always have the option to perform a clean installation of Windows 10. A recommended software for ripping is 'DVDFab ...

How to Create a Virtual DVD or CD on a USB Drive. Virtual CDs and DVDs, also called disc images, are single files containing data stored within a CD or DVD file system.

An ISO disc image is a special file that stores the contents of an entire CD or DVD on your computer hard drive. Keeping an ISO backup of expensive software such as Microsoft Office on your ...

Next, you'll choose your media type - are you burning the ISO file to a DVD? Or are you wanting to install it from a USB flash drive or external USB device?