

The total disk space available to your Mac is equal to the smallest member of the RAID 1 mirrored set, minus a slight amount of overhead. For example, if you have a RAID 1 set that consists of a 500 GB drive and a 320 GB drive, the total amount of space available to your Mac would equal 320 GB. Apr 28, 2013 - Backing up your system is one thing, but if you want to make an exact copy of your hard disk – operating system, software, and all of your files. As a rule of thumb, drives with the 'for Mac' suffix in the drive's name will be already formatted for use with a Mac computer. Examples: Free Agent Go for Mac, Backup Plus Slim Portable Drive for Mac. Other family of drives will be versatile and allow you usage on both a Mac and a PC. The 'GoFlex' and 'Plus' families are such drives. The Best Backup Software of 2018. Hard drives are notorious for crashing. Both Windows and Mac OS X have beefed up their built-in backup tools in recent years.