Back Up benefits

As you may know, I've a laptop and desktop that are primary computers. Backing up data from both allows me to keep a copy in case of software/hardware failure, it also allows me to use the hard disk to sync data between computers but some data I won't sync to the laptop due to the nature of the laptop and theft. So instead when I need these types of files, I get my hard disk out instead of stating up my desktop computer. This allows me to save lots of time!