External cd hard drives are a great way to back up your computer files and keep them safe. If your computer crashes, you can lose all of your files if you don’t have them backed up. External cd hard drives are a great way to back up your computer files and keep them safe. If your computer crashes, you can lose all of your files if you don’t have them backed up. External cd hard drives are a great way to back up your computer files and keep them safe. If your computer crashes, you can lose all of your …