Using Time Machine for back-up of multiple drives (8TB storage)

Discussion in 'macOS Mojave (10.14)' started by Yeroon, Jan 8, 2019.

  1. Yeroon macrumors member


    Jun 12, 2012
    Hi all! I've got a technical question that I couldn't find an answer for.

    I'm a power user with lots of data. I'm using an iMac Pro with internal 1TB SSD and an external Thunderbolt 3 bay with four 8TB hdd's in RAID10 (striped+mirrored) - 8 of 16TB used. All data is also back-upped in the cloud.

    Previously I had an 1TB external SSD attached to the Mac to make a Time Machine-backup of the Mac-drive (which contains the OS). I had an SSD crash once, so thanks to Time Machine my main system was up-and-running again within a few hours.

    Now I decided to use Time Machine for a backup for the whole system. So not just the 1TB internal SSD with macOS, but also including my giant external RAID-system (using an external 12TB usb-c drive). Time Machine has no problems with this and can make back-ups of multiple drives, which is absolutely great.

    My question is this: say my main (internal) 1TB macOS drive crashes, can I use Time Machine as I've previously did? As it's back-upping multiple drives, can I select the drive (or data) I want to restore? Or is Time Machine smart enough to understand that I only want to restore the 1TB SSD which contains the OS?

    That's what I would expect. Or will it restore ALL drives, including the 8TB external data? That would be a waste of time.

    It's probably a rhetorical question, but I'm just wondering is anyone has any experience with back-upping multiple drives with lots of data.
  2. BLUEDOG314 macrumors 6502


    Dec 12, 2015
    I did exactly this a while ago, IIRC, when you go to restore a startup volume, you will only see the option to restore disks that were a startup volume. This way there should be no confusion.

    Out of curiosity, what disk setup are you using to run a time machine of the RAID array?
  3. Yeroon thread starter macrumors member


    Jun 12, 2012
    Ah, good to know! That's the way I hoped it would work. :)
    I'm using an OWC Thunderbay TB3 with SoftRAID XT (4x 8TB WD RED, RAID10). I was actually (pleasantly) surprised that Time Machine wanted to make a back-up of it.

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