The fact that DVD and CD discs are much more stable than hard drives, you have to consider that backing up your files in DVDs or CDs is safer and will provide you with much more convenience. There is free backup software that you can download over the internet and install it in your computer. For example: Free Backup Mill. Basically, there are many free online backup services. Although it doesn’t really say that it is an online backup service, you can consider it to be so. You can try using your email account as your backup service as you can attach some important files and send it in your own email. This means that you will be able to have a copy of your files in the email.
Another good and recommended method to backup your important data is remote backups. As the name suggests, remote backup is backup store that you create in a remote computer. The concept of remote backup is just the same as online backup. However, it is important that you should not refer to it as the same. Remote backup is not online backup but is a part of it. It is where you save your file to another computer in real time.