Dragging your important stuff to another drive can work very well. The advantages of SuperDuper though, is worth considering.I don't use any backup programs. I have external drives and just drag and drop all of my important stuff every day. If my hard drive fails or I need to reformat I have no worries.
I have the little 500 gig travel hard drive that fits in a pocket for when I'm not home and as soon as photos go on the MacBook they are transferred to the hard drive.
Google is great for documents too. Just email them to yourself and they are safe in the cloud!
Dropbox is another option and you can access stuff from any computer by just logging in.
And for all my best photos Flickr is my friend. They are uploaded full size and safe in case of fire, flood etc
1. It takes about a minute to set up
2. it can operate automatically
3. Most importantly, if your drive dies and you need your Mac right away, you can boot from your Superduper drive and just keep on working. You can't do that when just dragging your files - you would have to wait until a new drive is available etc.