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Re: Time Machine: "Oldest backups are deleted when your disk becomes full."

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On 2014-04-26, David Empson <dempson@actrix.gen.nz> wrote:
> Davoud <star@sky.net> wrote:
>
>> That's fine by me. I'm a backup paranoid after losing a WordStar
>> document from my Osborne I in 1982.
>>
>> But it appears not to be working. TM says it can't backup because the
>> disk is too full. Based on the quote in the title, I expected it would
>> delete old backups to make room and go about its business.
>>
>> What don't I know?
>
> To clarify, there are two possible scenarios and I'm not sure which one
> you are encountering.
>
> (a) If you are trying to back up a new computer to a drive which is
> already being used for Time Machine backups of other computers, then the
> new backup can only start if there is enough free space. Time Machine
> will only delete old backups from the same computer in order to free up
> space for new backups.
>
> Note that some instances of computer/drive replacement might result in
> Time Machine thinking it needs to start a new backup rather than
> continuing an existing one. (I encountered this once when I was running
> somewhere around 10.5/10.6, but not when I had a similar situation
> around the 10.8/10.9 timeframe, so Apple may have improved the logic in
> later OS X versions.)
>

In this case it may be possible to use the shell command:
inheritbackup {machine_directory | sparsebundle} ot accquire the old backup.

I used this technique to "inherit" a backup sparsebundle produced on an
old MacBook by its replacement.

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Thread

Time Machine: "Oldest backups are deleted when your disk becomes full." Davoud <star@sky.net> - 2014-04-26 00:59 -0400
  Re: Time Machine: "Oldest backups are deleted when your disk becomes full." Barry Margolin <barmar@alum.mit.edu> - 2014-04-26 01:21 -0400
  Re: Time Machine: "Oldest backups are deleted when your disk becomes full." David Ritz <dritz@mindspring.com> - 2014-04-26 17:19 -0500
  Re: Time Machine: "Oldest backups are deleted when your disk becomes full." dempson@actrix.gen.nz (David Empson) - 2014-04-27 11:15 +1200
    Re: Time Machine: "Oldest backups are deleted when your disk becomes full." Tom Stiller <clusterfux.upmon@gmail.com> - 2014-04-27 00:01 +0000
    Re: Time Machine: "Oldest backups are deleted when your disk becomes full." nospam <nospam@nospam.invalid> - 2014-04-26 20:04 -0400
    Re: Time Machine: "Oldest backups are deleted when your disk becomes full." Davoud <star@sky.net> - 2014-04-27 21:26 -0400
  Re: Time Machine: "Oldest backups are deleted when your disk becomes full." J Burns <burns4@nowhere.com> - 2014-04-28 16:40 -0400

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