Periodically backing up your computer is always a good idea. You want to make sure your documents, photos, and files are protected in case of hardware failure, software glitches, or malware attacks.

So here's the backstory - I have a 2005 PowerBook G4 (my computer) and a 2009 white MacBook (my wife's). The PowerBook is really starting to show its age - it's sluggish, has almost no free space left ...