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Time Machine backing up entire drive each time.

2297 Views 18 Replies Latest reply: Jun 18, 2012 3:21 PM by emanres RSS
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ChickenMuffin Level 1 Level 1 (30 points)
Currently Being Moderated
May 4, 2012 1:15 PM

I use a 500 GB FireWire drive to share files between my two computers (iMac and MacBook Pro) in order to get better performance out of programs like Logic, and not have to worry about syncing my files. Obviously, due to the portable nature of all my data, it is IMPERATIVE that I have a backup.


I have a 2TB Lacie drive plugged into my imac which backs up the iMac and the External dive when it's available, the MacBook Pro is setup such that it backs up to the same drive over the network when it is available. The MBP does NOT backup the external drive when it's connected, it only backs up from the imac. I have several other drives daisy chained on the imac of crap files that don't matter, and they don't back up at all (the external is added to the end of this chain, and the Time machine disk is first, though I can't imagine how this could have any effect.)


Anyways, every time I work on the MBP and then re-plug the drive into the iMac to continue work and do a backup, the time machine starts from scratch and backs up the entire drive.


I thought that my backup may have been corrupt, so I wiped the time machine disk and started fresh, but it's still doing it. This was not happening a few months ago, so I'm not sure what's changed.


Any thoughts?

iMac, Mac OS X (10.7.2), 27", 2.66 i5, 16 GB RAM, 1TB HDD
  • Gerry Brown Calculating status...

    I think hat Time Machine will notice that your MBP's last backup was "too long" ago and back it up totally.  If I remember, there is a preference that can be changed.

  • Radiation Mac Level 5 Level 5 (4,630 points)

    Are you shutting down the iMac each time before you unplug the external Time Machine harddrive?  If not, are you, correctly, "Ejecting" the external harddrive in 'Disk Utility' BEFORE unplugging it from the iMac each time? This would be one possible source of the problem.


    Hope this helps

  • Linc Davis Level 10 Level 10 (108,150 points)

    Launch the Console application in any of the following ways:


    Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)


    In the Finder, select Go Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.


    If you’re running Mac OS X 10.7 or later, open LaunchPad. Click Utilities, then Console in the page that opens.


    Select "system.log" from the file list. Enter "backupd" (without the quotes) in the String Matching text field. Post the messages from the last backup, beginning with "Starting standard backup."


    Post the log text, please, not a screenshot. If there are runs of repeated messages, post only one example of each. Do not post many repetitions of the same message.


    Some personal information, such as the names of your files, may be included — edit that out, too, but don’t remove the context.

  • Linc Davis Level 10 Level 10 (108,150 points)

    That wasn't a full backup. If you have large files that change often, your backups are going to take a lot of space. That can't be helped.

  • Linc Davis Level 10 Level 10 (108,150 points)

    I'm going by the information you provided, which shows that most, but not all, the data on the drive was backed up. If the information you give me is wrong or incomplete, then what I give you will be wrong too.


    After a backup finishes, immediately start a new backup manually without having touched anything on the drive. Does TM still back up the same amount of data?

  • Linc Davis Level 10 Level 10 (108,150 points)

    What I meant was, start a new backup immediately without disconnecting the drive or doing anything else to it. I am trying to determine whether switching the drive between hosts is causing the issue.

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