1 Reply Latest reply: Jan 9, 2012 6:47 PM by Pondini
Raymond Fox Level 2 Level 2 (255 points)

Recently, when my system disk began to fail, I purchased two 1TB hard drives to replace it.  I then configured both drives as one RAID set so that any data on my system disk would automatically be written on the second disk as a backup. But now I'm wondering whether it would have been better to have designated the second drive as a Time Machine backup drive?  For one thing, if I accidentally erased a file, I could retrieve it if the second disk was a Time Machine backup disk, but I think it'd be gone forever with a RAID set.  Also, Lion's Disk Utility does not repair permissions on a RAID set (without resorting to terminal commands).

 

Any input on which method of backing up I should choose? 

  • Pondini Level 8 Level 8 (38,720 points)

    Raymond Fox wrote:

    . . .

    But now I'm wondering whether it would have been better to have designated the second drive as a Time Machine backup drive?

    Yes, in several ways.

     

    For one thing, if I accidentally erased a file, I could retrieve it if the second disk was a Time Machine backup disk, but I think it'd be gone forever with a RAID set. 

    That's correct.

     

    Also, Lion won't put a Recovery HD on a RAID set (just why isn't clear).

     

    If you're thinking of using FileVault2, it won't do that, either.

     

    Any input on which method of backing up I should choose?

    Time Machine is the easiest and simplest.  You might want to review the Time Machine Tutorial, and perhaps browse Time Machine - Frequently Asked Questions.

     

    If you're unsure about different types of backups, see Time Machine vs. Clones and Archives.