Previous 1 2 3 Next 32 Replies Latest reply: Oct 28, 2013 6:36 PM by ejtrim Go to original post
  • Pondini Level 8 Level 8 (38,715 points)

    ejtrim wrote:

    . . .

    I had simply moved with the mouse on Finder several large directories into another just created directory.  I had understood that Time Machine made hardlinks on directories, and thus this simple movement should only cost a few bytes of hardlinks in my backup disk.

    No, if you copy, move, or rename a folder, it's treated as changed, and all its contents are backed-up again.  

     

    A hard link is made on the backup drive when a file or folder does not change at all from one backup to the next.

     

    If you know that's going to take a lot of space, you can delete all backups of the file in the old location or with the old name, per Time Machine - Frequently Asked Question #12. 

  • ejtrim Level 1 Level 1 (0 points)

    ejtrim wrote:

     

    I had understood that Time Machine made hardlinks on directories,

    I've also observed that Time Machine does multiple copies of single files when they are the destination of multiple hardlinks.  I understand that it's relatively costly to keep track of hardlinks, but I regret that one cannot use rsync with the link-dest option without Time Machine copying multiple times the same file.  Space in the backup disk is precious!

  • ejtrim Level 1 Level 1 (0 points)

    Here are we back, Time Machine and me, one year later with the same kind of problems. I had to recognize first that I didn't do the reinstallation of my Snow Leopard that Pondini recommended (thanks again), possibly because the problems mostly disappeared at the time. Well, they reappeared in April but then Time Machine only unexpectedly deleted files that were to be deleted anyway a few days or hours later. It's now, again in the vicinity of a daylight saving time change, that Time Machine is deleting some apparently randomly chosen weekly backups much earlier than expected, without any disk space needs, as it's shown in the system.log below. My iMac is most of the time on, so there are many other weekly backups intermixed with the ones deleted, currently the oldest remaining backup is dated Dec 2012.

     

    Oct 29 00:28:11 iMac com.apple.backupd[5268]: Starting standard backup

    Oct 29 00:28:11 iMac com.apple.backupd[5268]: Backing up to: /Volumes/iMac HD Time Machine/Backups.backupdb

    Oct 29 00:28:46 iMac com.apple.backupd[5268]: No pre-backup thinning needed: 4.53 GB requested (including padding), 58.31 GB available

    Oct 29 00:30:23 iMac com.apple.backupd[5268]: Copied 1481 files (2.2 GB) from volume Macintosh HD.

    Oct 29 00:30:42 iMac com.apple.backupd[5268]: No pre-backup thinning needed: 1.95 GB requested (including padding), 56.15 GB available

    Oct 29 00:30:56 iMac com.apple.backupd[5268]: Copied 1060 files (5.3 MB) from volume Macintosh HD.

    Oct 29 00:31:03 iMac com.apple.backupd[5268]: Starting post-backup thinning

    Oct 29 00:32:59 iMac com.apple.backupd[5268]: Deleted backup /Volumes/iMac HD Time Machine/Backups.backupdb/iMac/2013-04-01-000657: 68.02 GB now available

    Oct 29 00:34:18 iMac com.apple.backupd[5268]: Deleted backup /Volumes/iMac HD Time Machine/Backups.backupdb/iMac/2013-06-03-000300: 78.20 GB now available

    Oct 29 00:35:34 iMac com.apple.backupd[5268]: Deleted backup /Volumes/iMac HD Time Machine/Backups.backupdb/iMac/2013-08-12-005800: 87.57 GB now available

    Oct 29 00:36:54 iMac com.apple.backupd[5268]: Deleted backup /Volumes/iMac HD Time Machine/Backups.backupdb/iMac/2013-09-16-001517: 93.86 GB now available

    Oct 29 00:36:54 iMac com.apple.backupd[5268]: Post-back up thinning complete: 4 expired backups removed

    Oct 29 00:36:55 iMac com.apple.backupd[5268]: Backup completed successfully.

     

    In addition, there have been recently several unexpected deletions of daily backups, the worst one a couple of weeks before its due date. But the weekly backup deletions shown above is alarming.

     

    Since Snow Leopard update 10.6.8 in July 2011, Time Machine hasn't received any update, and is still in version 1.1.

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