Disk Utility, RAID1, Ext HDs, and CCC


macrumors regular
Original poster
Feb 11, 2012
Any idea if this will work?
  • iMac USB connected to (2) external HDDs
  • Disk Utility to setup RAID1 on external HDDs
  • Time Machine backups for USB connected iMac and Wifi connected MacBook Pro to external HDDs
  • Carbon Copy Cloner backs up for both Macs
  • Periodically swap out the second external drive with a third one that is kept offsite


macrumors 65816
Nov 14, 2009
1. What is the point of using CCC to do backups when you're already using time machine?

2. Swapping out one of the drives in a RAID 1 setup will see the 3rd drive needing to be rebuilt manually by the OS every time it is connected, which will wear all drives out earlier, as well as taking many hours depending on hour much data is being backed up.


macrumors 6502a
Mar 19, 2014
RAID-1 is more for immediate online project data redundancy in a small(er) setup such as yours. If the ultimate aim is just to provide backups then a mixture of TM and CCC onto bare JBOD drives is enough I think.

As matreya mentioned, there is complication /limitation involved with the software RAID setup, it does not behave as throughout as a hardware RAID enclosure which has its own controller.


macrumors Core
Feb 20, 2009
Skip the RAID idea. Old saying: "RAID is not a backup".

DO use CCC to create bootable cloned backups - FAR superior than Time Machine (in my opinion).

Use more than one backup and "rotate" that off-site from time to time.
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