MacMost: Backup

Why You Should Never Partition Your Backup Drive
It is tempting to partition a backup drive so you can use some of that storage space for other things. But you should avoid doing so for two key reasons.
Understanding the Difference Between Backing Up and Archiving
Many people confuse backing up with archiving. These are two very different things that both involve external drives and your files. But it is important to understand the difference and have both a backup and an archive for your Mac.