Disk full: Re-claim disk free space after Catalina install

Discussion in 'macOS Catalina (10.15)' started by coolbreeze2, Jun 9, 2019.

  1. coolbreeze2 macrumors 6502a

    coolbreeze2

    Joined:
    Sep 24, 2009
    #1
    After installing Catalina and you go to About This Mac-Storage, your disk might be nearly full even though you actually don't have that many files to fill up your disk. Claim your free space back by doing the following:

    1) Open the Terminal app
    2) Type: tmutil listlocalsnapshots /System/Volumes/Data

    This will give you list of local snapshots. The list will look like this:

    com.apple.TimeMachine.2019-06-08-213522.local

    com.apple.TimeMachine.2019-06-08-223633.local

    com.apple.TimeMachine.2019-06-09-023529.local

    com.apple.TimeMachine.2019-06-09-043524.local

    com.apple.TimeMachine.2019-06-09-072142.local

    com.apple.TimeMachine.2019-06-09-201201.local

    3) Delete any or all by typing: tmutil deletelocalsnapshots 2019-06-08-213522

    2019-06-08-213522 is the snapshot you want to delete. Delete one at a time.

    I have found deleting all snapshots did not have an adverse consequence on my Time Machine backups
     
  2. zhaoxin macrumors 6502

    Joined:
    Jan 28, 2015
  3. coolbreeze2, Jun 9, 2019
    Last edited: Jun 9, 2019

    coolbreeze2 thread starter macrumors 6502a

    coolbreeze2

    Joined:
    Sep 24, 2009
    #3
    Yes they will always be added by the OS. I have found that they are not large enough to be a problem on a usual basis. It's only when you have downloaded or added a large file such as an OS installation or something large like Xcode. If disk space is not an issue then there is no need to delete them. If disk space is an issue, then delete some or all.
     
  4. Shirasaki macrumors G3

    Shirasaki

    Joined:
    May 16, 2015
    #4
    In my case before nuking macOS 10.15, the available space just go smaller and smaller, even after I delete a good chunk of files. My local time machine snapshots were all gone.
    I end up going back to high Sierra because all I wanted from catalina was to install iOS 13 b1. Did not spend a lot of time trying to figure out why.
     
  5. mikecwest macrumors 6502a

    mikecwest

    Joined:
    Jul 7, 2013
    #5
    A better way to get rid of the snapshots is to plug in your time machine drive, and “backup now.”

    It’s not a good idea to suggest deleting a persons backup with explaining that is what you are doing.
     
  6. coolbreeze2 thread starter macrumors 6502a

    coolbreeze2

    Joined:
    Sep 24, 2009
    #6
    Yes I am.
     
  7. mikecwest macrumors 6502a

    mikecwest

    Joined:
    Jul 7, 2013
    #7
    Actually no, you said "I have found deleting all snapshots did not have an adverse consequence on my Time Machine backups."

    What if that snapshot contains the file/files that they might need to restore at some point in time? Not everyone will understand what a snapshot is. I am sure if you have been on the internet long enough, you know that forums are full of people who are over-their-heads and don't have the same technical knowledge as everyone else...but that’s ok, that is how we learn. I just feel a better disclaimer like "This will delete your local backups, that have not been added to your Time Machine Backup yet." Honestly, I think it is best to allow the backup to sync to your backup disk, and have it removed that way.
     
  8. MacManiac76 macrumors 65816

    MacManiac76

    Joined:
    Apr 21, 2007
    Location:
    White Mntns, Arizona
    #8
    There must be a bug then, because the snapshots are not being automatically deleted. My Time Machine backup drive is always connected and more snapshots have been created since I last deleted them after first reading this post.
     
  9. Shirasaki macrumors G3

    Shirasaki

    Joined:
    May 16, 2015
    #9
    Given that macOS 10.15 is still in beta 1, this method might be helpful to claim some disk space back on internal storage. It could also come in handy to troubleshoot Time Machine issue.
    On the other hand, I do agree that a user should ideally connect Time Machine backup drive to their Mac all the time, or at least once per day for the Time Machine to complete a full/incremental backup. Time Machine backup is also handy when testing beta software, like macOS 10.15 beta 1.
     
  10. DeanLubaki macrumors 6502a

    DeanLubaki

    Joined:
    May 29, 2014
    Location:
    Toronto
    #10
    They won't reappear every day. This is expected behaviour: Apple noted in the release notes that the install creates a local backup in case someone wants to revert to Mojave.
     
  11. coolbreeze2 thread starter macrumors 6502a

    coolbreeze2

    Joined:
    Sep 24, 2009
    #11


    That’s smart of Apple. But since most people create a backup to an external storage before installing Catalina, the local snapshot can be deleted if space is an issue. However if no external backup of Mojave was completed then deleting snapshots is not a good idea.
    --- Post Merged, Jun 11, 2019 ---
    Yes this is true for me also.
     

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10 June 9, 2019