Well for this option there are a few things. If you are looking to simply backup the data there are a ton of options on the market. For simply backing up data in the case of a failure or a virus ther are many options you have. If you are looking to get a basic backup that does it for you I would reccomend looking into a Newegg.com - my passport essential
My book harddrive as they actually come with software on them that you simply install and then it will have a smartbackup option to backup essential things like pictures and music. On the other hand there are also network storage options all depends on what you are doing. If you have anymore questions let me know.