World Backup Day is the last day of March every year. I recommend that everyone have not only a local backup option and an online backup solution to backup your files offsite. You never know when a hard drive may fail or some sort of disaster could happen and you lose all your files.
The two programs I recommend
Backblaze online backup: http://www.backblaze.com/
Acronis True Image Home Local Backup: http://www.acronis.com/