You can use either a flash drive or an external hard drive.
Plug your USB flash drive or external hard drive into your PC’s or laptop’s USB port on the side of your computer.
Then go to your home user files on your computer and copy and paste everything like photos, documents, downloads, and music folders onto your USB drive.
Also, check your desktop screen for any folders or photos.
Backups should be done everyday just in case you ever need to perform a factory reset.