Windows 10 updates are complete mess. There's no control over when they'll run and, when they do run, they often fail, leaving you with the 'solution' being that you must reinstall the OS.
Why must you back up your computer? Because you will need it one day and it's far better than losing important photographs, letters and other documents. Backups are essential.
My thoughts about Apple computers five years after switching to the platform from Windows. Would I now switch back to Windows again?