Backup data is essentially creating a mirrored version of the content within your device and storing it elsewhere for safekeeping. A copy of your data should be transferred outside of its current device, not copied and stored locally. By saving your documents outside of the original device, you ensure that in the event of theft or damage, your documents are still accessible.
Start by purchasing a large external hard drive and attach it to your computer and then set an automatic backup to run manually or on a fixed schedule such as daily or weekly. External hard drives often create a replica of the file name, structure, and location of your personal computer onto the external hard drive.
For desktop computers, all you need to bring in is the tower and any CD's you can find that belong to it (cables, monitors, keyboards, and mice are not needed).
For laptops, please be sure to bring in the charger as well as any CD's you can find. We do not need your laptop case.
Also, if you are having a problem with a specific device (ex. your computer speakers aren't working) please bring in that device.