Create a bootable USB flash drive to keep an extra OS of Windows or Ubuntu.
You always want to have a copy of your Linux or Windows operating system on a separate device other than your computer. Because even if your computer or laptop is relatively new, it's very easy for some random fluke - an internal error or virus - to completely shut you down when you least expect it.
Be prepared for the worst so your computer always works at its best. Check out this computer tutorial to learn how to boot Windows or Ubuntu from a USB flash drive. This video will focus on booting Windows and Linux.