Follow these three golden rules for the simplest way any home user to ensure their data is backed up and safe.
3 copies of anything you care about – Two isn’t enough if it’s important.
2 different formats – Example: Hard Drive+DVDs or Hard Drive+Memory Stick or CD+Cloud, or more
1 off-site backup – If the house burns down, how will you get your memories back?
Remember that using just one kind of backup (eg, an external hard drive or SD card backup) is really not a backup. You need both off-site backup storage (eg, cloud backup), plus backups to different media types and multiple copies of everything you want to protect.