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Changing sytem disk: restore from Time Machine rather than full copy?
Authored by: palahala on Feb 21, '09 01:11:10AM

I wonder if Time Machine will continue making incremental backups when restoring a backup to a new drive. If true, then for those who are still planning to swap the drive of their Mac for another drive: maybe a full system restore from Time Machine to the new disk will save you from having to change the UUID.

And when doing a full restore to a new disk, I am curious if Time Machine will then change the UUID of the target disk (which would not make it very unique then...) or on the backup disk.



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Changing sytem disk: restore from Time Machine rather than full copy?
Authored by: only_solutions on Feb 21, '09 01:33:04AM
According to Apple Support (yes, I actually asked them about it! ;-) ) a restore from a Time Machine backup does unfortunately result in a completely new full backup being made right again which is obviously stupid, but consistent with the way the mechanism seems to work.

I'm with you in that, of course: They should either adapt the UUID in the backup or have a separate mechanism for this purpose to avoid such a pointless double backup. It actually reduces data security because the pointless double backup pushes older backups off the disk if there's not enough space plus of course it stresses both the original and the backup harddisks much more than necessary.

On the other hand having multiple drives with identical UUIDs looks like a really bad idea – too many potentially serious consequences could ensue.

So if this information is in fact true (can anybody attest to that who has made a Time Machine restore and tried to resume Time Machine backups to the same drive?), this hint here could be very useful in that case as well.

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Changing sytem disk: restore from Time Machine rather than full copy?
Authored by: palahala on Feb 22, '09 01:54:33AM

Giving it some more thought, I can image some people might restore a backup on another drive just for testing or whatever. One indeed does not want this to result in changing some UUID in the backup, as that would render that backup useless for the original drive.

So I guess your solution is better than having Time Machine decide when to make some changes: only people who know for sure they want the UUID of the backup changed will now be able to do so, and those will understand that removing that sticker will void their warranty ;-)

Many thanks for the info!



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Changing sytem disk: restore from Time Machine rather than full copy?
Authored by: only_solutions on Feb 22, '09 06:34:59AM

You are probably right...!

And you're welcome; Of course I owe most of the thanks to this site and to other contributors. :-)

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