Yes...you can use a free 3rd party software (Macrium, Aomei, Acronis and others) to backup your personal files/folders or completely copy the entire hard drive. You will need an extra internal or external HDD (hard drive) large enough to hold the data you want saved. A 500 GB portable USB HDD should be plenty and you can probably pick one up for $50 or less.
As stated above...the upgrade path will allow you to save all your personal data....where as the clean install wipes the drive clean. Your are given the option when installing the OS as upgrade or custom and custom is where the clean install takes place.
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