"Most computers run the OS they came installed with until they're scrapped... because most non-specialists would prefer to just buy a whole new computer than deal with trying to change their OS. The majority of desktop and laptop computer users have never seen or used anything but Windows, and of the remainder, most use Macs - and the same applies. Most Macs will never run anything but their original copy of macOS."
"Before you start, back up all your stuff. Ideally, make at least two complete backups of all your files, and this includes the data files of apps that store and manage data, such as email clients. Buy some USB keys, a couple of small ones and a couple of the biggest ones you can afford. Using the OS's built-in tools, do a full backup of the whole computer onto one of the big keys."
Most desktop and laptop users keep the operating system that shipped with their machine, and many have never used anything else. Switching operating systems is a major step that most non-specialists avoid, but adopting free and open-source applications does not require an OS change. Reinstalling the existing OS can restore speed and reliability; a clean installation is recommended when feasible. Before reinstalling, create at least two complete backups, include application data such as email stores, and keep manual copies. Use multiple USB drives and the OS's built-in backup tools to secure data before any OS work.
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