There are plenty of great options to backup your data, including the built in options for Windows and OS X if you own an external hard drive.
Check this guide if you are a Windows user: Backup and Restore
Try this guide if you are a Mac user: Time Machine
If you prefer to have a little more power over your backups, check our plethora of backup tools here at Afterdawn: Software section
Of course, you are willing to have your files in the cloud, Box is a great alternative, with 5GB free space.