# Just how can I get Time Machine to reassociate with my computer system?

I've lately had a MacBook Pro require to have its reasoning board changed, this caused particular identifiers of the equipment transforming (MAC address, etc) so Time Machine no more concerns it as the very same equipment, and also will certainly no more execute back-ups.

I have actually recovered from the backup with no trouble, and also was wishing this would certainly motivate it to become aware there was a solitary factor at which both the computer system and also the back-ups remained in synch, and also would certainly therefore remain to execute step-by-step back-ups from that factor on, yet it stubbornly rejects to permit back-ups.

If I need to shed the old back-ups and also start afresh, I'll have the ability to deal in some way, yet I would certainly favor to maintain the background when possible.

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2019-05-07 07:41:49
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Answers: 3

There's complete guidelines on just how to do it at this answer from MacOSXHints.com

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2019-05-09 05:02:58
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As Alnitak mentioned, macosxhints.com has instructions for doing this. Below's another related hint, which features a large" DISCLAIMER : Do this at your very own threat! " that need to possibly embellish both of them.

(I would certainly have merely included the links to Alnitak's solution, yet we're all beginning again from a weak 101 online reputation below, so no editing and enhancing of other individuals's solutions yet ...)

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2019-05-08 22:27:30
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Based on the information at the given web links from Alnitak and also John's earlier solutions, below is what I did :

1. Plugged in the (USB) Time Machine HD
2. Turned Time Machine off
3. Found the existing ethernet MAC address
4. Disabled the ACLs on the TM
5. Moved the. [old mac address ] documents in the origin of the TM to be. [new mac address ]
6. Updated the expanded feature for the Backups.Backupdb/ [equipment name ] to match the new mac address
7. Reenabled the ACLs
8. Ejected and also disconnected the TM HD
9. Turned Time Machine back on
10. Plugged the HD back in once more

Steps 4 via to 7 were done as adheres to :

$sudo fsaclctl -p /Volumes/Time\ thingy/ -d$ mv .[old mac address] .[new mac address]
$sudo xattr -w com.apple.backupd.BackupMachineAddress [new mac address (with colon separators)] Backups.backupdb/Thalia/$ sudo fsaclctl -p /Volumes/Time\ thingy/ -e


It ran the backup ALRIGHT (considering the inodes it recreated the whole directory site framework, yet connected the documents to the formerly supported variations where it could, so not remarkable, yet adequate), and also I can currently "Enter Time Machine" and also see the predicted background.

As a little a side note, prior to resetting the xattr I ran xattr -l (checklist) on the Thalia directory site (seeking any kind of various other features that could be around to create troubles), and also saw that the pre - existing mac address was presented in hex editor design (the address column (0000 on one line, 0010 on the next), the hex information column (each byte divided by a room), and also the information column) and also the information was in fact ended by an absolutely no byte. After resetting it, it is simply presented merely as the mac address string (so probably not ended by an absolutely no byte) - I'm wishing this will not create troubles.

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2019-05-08 10:45:34
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