When Time Machine deletes old backups?

Discussion in 'Mac Basics and Help' started by nelly22, Nov 20, 2015.

  1. nelly22 macrumors 6502

    Joined:
    Sep 29, 2009
    #1
    I have 120 GB internal SSD and 40 GB is used.

    What is the GB limit when Time Machine starts to delete old backups because there is not enough space in external Time Machine drive?
     
  2. chscag macrumors 68000

    Joined:
    Feb 17, 2008
    Location:
    Fort Worth, Texas
    #2
    Time Machine will warn you that it will delete the oldest backup when there is not enough space remaining on the drive to complete the current backup.
     
  3. nelly22 thread starter macrumors 6502

    Joined:
    Sep 29, 2009
    #3
    Thanks, but then it's already deleted stuff and it's too late to save any stuff if needed.
     
  4. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #4
    Here is the purge criteria Time Machine uses. It is not based on GB, but space available on the external backup destination. If you had a fairly small amount to backup with few data additions or changes, and a large external disk, you could have those weekly backups still on there from years ago.

    Screen Shot 2015-11-21 at 9.11.43 AM.png
     
  5. nelly22 thread starter macrumors 6502

    Joined:
    Sep 29, 2009
    #5
    Thanks. I had over 300 GB space in external TM drive and backup was about 300 MB and still TM deleted old backups!?!?!
     
  6. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #6
    I shouldn't. It should keep the weekly backup as long as there is space left.
     

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