I frequently recommend you purchase an external hard drive for your backups. Backing up to an external drive is probably the most important first step in getting an overall backup strategy in place.
The inevitable question is, “What external drive should I buy?”
The problem, of course, is that the answer keeps changing. Technology evolves, and as a result, so does my recommendation.
Let me give you a few guidelines, and then a few current (as of this writing) examples.