Then you need to clean up your Mac and prepare for disk partition, so if any other unwanted program that might become the reason for virus or interruption can easily remove. If anything goes wrong in the partition process, you still have the backup files. First thing to do is to backup your files on Mac using Time Machine. The very primary step before moving towards partition hard drive on Mac, you must backup and clean up the internal hard drive of Mac. Part 3: What Are The Benefits and Risks of Partitioning A Macīefore Partitioning A Mac: Backup and Clean it Up First!.Part 2: Here We Go! How to Partition A Hard Drive on Your Mac?.