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so how does Time Machine differentiate?
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Senior User
Join Date: Nov 2003
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I see that the backups have some number in the file name (on the TM drive)...
I recently had my powerbook fixed by Apple and they put in a new logic board. I don't know if that makes a difference, but Time Machine is create a new backup instead of updating my old one.
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Dedicated MacNNer
Join Date: Jun 2006
Location: Chicago
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I believe TM uses the Machine Address Code to track backups. Assume you have new MAC now that your Mac has a new logic board.
QS
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Senior User
Join Date: Nov 2003
Status:
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is there any way I can use my previous backup, or do I have to start a new one?
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Admin Emeritus  Join Date: Oct 1999
Location: Zurich, Switzerland
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1. Time Machine does indeed use the MAC address of the Ethernet on the logic board to identify a backup. (Note: MAC stands for "Media Access Control".)
2. let me google that for you -- the VERY FIRST link answers this common question.
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Senior User
Join Date: Nov 2003
Status:
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Super but that is NOT a solution that I would consider acceptable for a common problem. The less time consuming method is to just start a new backup and keep the old one around for a while.
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Professional Poster
Join Date: Jan 2000
Location: Columbus, OH
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Originally Posted by MOTHERWELL 
... The less time consuming method is to just start a new backup and keep the old one around for a while.
Isn't that the default behaviour of TM?
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Admin Emeritus Join Date: Oct 1999
Location: Zurich, Switzerland
Status:
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Originally Posted by MOTHERWELL
Super but that is NOT a solution that I would consider acceptable for a common problem. The less time consuming method is to just start a new backup and keep the old one around for a while.
O...k... so what was the point of your post?
Many people prefer not to have the backup duplicated, for several reasons:
1. for many people, the new initial would be extremely time-consuming (esp. when using a Time Capsule)
2. all the space consumed by duplicating the files is space that is no longer available to keep backups going back as far in time
3. because the old backup is "disconnected", it won't automatically begin to be deleted as the disk gets full
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Senior User
Join Date: Nov 2003
Status:
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I prefer not to have the backup duplicated for for those exact reasons. I was hoping there was a simple solution to this, not the solution that google came up with (which is old and doesn't even work, btw)
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Posting Junkie
Join Date: Dec 2000
Status:
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It works fine - I did that a few months ago when I had the motherboard replaced on my MBP. No issues at all.
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Admin Emeritus Join Date: Oct 1999
Location: Zurich, Switzerland
Status:
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Originally Posted by MOTHERWELL
I prefer not to have the backup duplicated for for those exact reasons. I was hoping there was a simple solution to this, not the solution that google came up with (which is old and doesn't even work, btw)
 OK so you prefer to have it duplicate, but you prefer to have it not duplicate? Uhh...
And yeah, the instructions cannot have changed, as Leopard has not yet been replaced with anything else.
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Posting Junkie
Join Date: Nov 2000
Location: in front of my Mac
Status:
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Apple should have put something like this into the TM menu item. 
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