Unable to inherit previous Time Machine

Discussion in 'macOS Mojave (10.14)' started by orbitalpunk, Sep 28, 2018.

  1. orbitalpunk macrumors 6502


    Aug 14, 2006
    I did a fresh install of Mojave on my nMP and in the past I could reconnect my Time Machine from the previous OS without having to start over. But this time I am getting an error. Has anyone experience similar issues? Usually I can go into terminal and use the following command

    sudo tmutil associatedisk -a /

    the full command would be like this:

    sudo tmutil associatedisk -a / /Volumes/Harddrive/Backups.backupdb/Mac\ Pro/2018-09-26-235241/Macintosh\ HD

    But now I get the following error:

    Failed to gather snapshots for /Volumes/Harddrive/Backups.backupdb/Mac Pro
  2. Howard2k macrumors 65816


    Mar 10, 2016
    I did a clean install and had a Time Machine volume on my NAS and it had no issue opening it directly from the GUI. No CLI. I just opened the Time Machine prefs and added the drive through there I think.

    I was really impressed how smooth that was.
  3. Mr.Chow macrumors member


    Jan 27, 2013
    I'm getting the same error when I try to inherit a backup. Time machine seemed far more stable in the last beta...
  4. interstella macrumors regular


    Sep 29, 2013
    Suffolk, England
    After installing Mojave I took a chance and deleted my TM backups off my NAS and started again. What I have noticed is that, previously, every hourly backup had the NAS drives working furiously and noisily. With Mojave, the backup process is barely noticeable.
  5. Ronis_BR macrumors newbie

    Jun 4, 2017
    Hi @orbitalpunk,

    I am having this exactly same problem! In my case, I have a HFS+ partition in which I deleted and copied all the data to a volume inside the APFS container. In this case, I needed to associate the new volume with the old one. The command `sudo tmutil associatedisk -a ...` failed with the same error message. My only solution after trying for one hour was to format the external time machine HD and start again.
    --- Post Merged, Oct 1, 2018 ---
    I submitted a Feedback to Apple.
  6. Ronis_BR macrumors newbie

    Jun 4, 2017
    Did anyone tried this after recreating the TM in Mojave?
  7. RabidMacFan macrumors regular

    Jun 19, 2012
    I had the opposite issue. I did a fresh install of Mojave and when I plugged in my High Sierra time machine disk, it automatically started comparing the previous backup and made the adjustments in the same parent folder.

    I would have preferred that time machine started from scratch with a new backup directory.

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