Re-pairing TM backup with new Mac

I recently restored my Time Machine backup on a new iMac. This went fine, but I no longer seem to be able to use the existing Time Machine backups.
There is one somewhat relevant article on macosxhints, but the re-pairing procedure mentioned there does only work for a replaced logic board and not for an entirely new Mac. (http://discussions.apple.com/thread.jspa?threadID=1888391)
Is there a way to re-pair the existing Time Machine backup with the new iMac?
EDIT: The two iMacs do not have the same specs. The old one is from late 2006, while the new one is from either mid 2007 or late 2008.
Message was edited by: ddfreyne

Does the iMac have the same specs as the old Mac? If so, than the instructions from the post you cited about the logic board will work, since the MAC address is what pairs a TM Backup with a computer.

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Existing TC backup with new Mac - Problems?

I've updated to a new iMac and used Migration Assistant to load it. Now I can't seem to BU to the existing TC backups from mu old iMac.
Calculates changes, says it's deleting old backups but still gives the latest BU date from the old system.
I guess I can't append the new iMac BU to the old one.
Wipe TC and start again?
Kind Regards
Hugh

Fat Hugh wrote:
I've updated to a new iMac and used Migration Assistant to load it. Now I can't seem to BU to the existing TC backups from mu old iMac.
Calculates changes, says it's deleting old backups but still gives the latest BU date from the old system.
I guess I can't append the new iMac BU to the old one.
Is the backup still running? Since it's a new Mac, TM will do a new, full backup, so if your TC was anywhere near full, it has to delete a very large number of old backups. On a Time Capsule, that takes a very long time, as it must delete the oldest backup, dismount the sparse bundle, compact it, then re-mount it to see if it's made enough space. This is repeated over and over.
If your TC's internal HD isn't well over twice the size of the data it's backing-up, TM will delete all but the latest backup, then fail for lack of space. In that case, your best bet is to cancel the backup and erase the TC's disk.
If not, you might be able to speed the process up by cancelling the backup, deleting a number of old backups yourself, per #12 in the Frequently Asked Questions *User Tip,* also at the top of the +Time Machine+ forum.
Click here to download the +Time Machine Buddy+ widget. It shows the messages from your logs for one TM backup run at a time, in a small window. Among other things, that will show how much space is needed, and how much is available now, so you can decide how to proceed.

No access to old mac's backup with new mac

Hi forum,
I bought a new aluminium MacBook to replace my "old" black MacBook, and migrated all data and settings with the assistant via Ethernet-cable. Worked fine.
Now, I want to continue using the over 1 year of TM-backups created with the old mac, because there are some files that are archived in these backups.
To achieve that, I found some terminal-voodoo on the internet to update the MAC-numbers within the old backup-files and tried those. Now, TM continues to backup into the same folder on my TM-hdd.
BUT whenever I try to access a folder backed up with my old MacBook, I get an error-message saying that the folder cannot be opened, because I do not have the rights to do this. That's all, no way to enter any password or so.
What can I do?
Thanks in advance,
Michi

.mhuber wrote:
Now, I want to continue using the over 1 year of TM-backups created with the old mac, because there are some files that are archived in these backups.
To achieve that, I found some terminal-voodoo on the internet to update the MAC-numbers within the old backup-files and tried those. Now, TM continues to backup into the same folder on my TM-hdd.
That may have been a major error. That's for the same computer with either a new hard drive or new logic board, not a different computer. You've "fooled" TM into mixing backups from two different computers, and it likely has made the old ones un-usable.
BUT whenever I try to access a folder backed up with my old MacBook, I get an error-message saying that the folder cannot be opened, because I do not have the rights to do this.
Are you doing this via the Finder, or the TM interface?
If at all possible, use the TM interface, either via +Enter Time Machine+ or +Browse Other Time Machine Disks.+
If not, you might be able to copy some data via the Finder, but it's going to be tedious with all sorts of problems. First, as you see, you don't have permission to read the files. Second, you won't get the "metadata" -- permissions, creation date, open-with info, etc. Third, if you do manage to copy them, their permissions probably won't be what you want.
As a last resort, try this:
Navigate, via the Finder, on your TM disk, to the backup you want, then to the folder you want. Select it, then select Get Info.
At the bottom of that panel, click the padlock, then enter your Administrator's password.
Then click the plus sign at the bottom of the panel; that should give you a place to select your ID.
Clicking on that should give you "Read only" rights.
Clicking on the "gear" icon should let you apply those rights to the enclosed items.
Also, for future reference, do NOT depend on TM to keep "archive" copies of things you've deleted from your internal HD. TM will, eventually, delete them; you cannot prevent it. If you want to keep them, make other copies somewhere else.

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• Or did you create a new User Account, then use the Migration Assistant app later on?
• Or did you do something else -- if so, what?
• Did any home folder names change, even slightly?
Yes, I did use Setup Assistant when the new mac booted for the first time.
No
No
Yes. The OLD HDD was called Macintosh HD1. The iMac HDD is called Macintosh HD. Not sure if this matters though
I don't remember the exact wording, but I was asked if I wanted to clean up the backups to work with the new computer.
Could it have been this one:
If so, see #C13 in Time Machine - Troubleshooting for the bad news.
Yes, I think that was the message I saw and I did indeed select "Start New Backup". So I suppose that means the data is corrupt.
Ok, so my old macbook disc was 500gb and the TM backup is 1TB. If everything was deleted, why am I running out of space when I try to create a new backup? This leads me to believe the data is still there and possibly still recoverable.
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