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10.5: Reconnect Time Machine backup after drive swap
Authored by: jb8748 on May 07, '11 05:12:30AM

I have just completed a hard disk swap using a time machine backup, Mac OS X Install DVD 10.6 and a system running 10.6.7. Time machine backup is on a shared USB drive on the network.

1) Ensure Time Machine back up is complete
2) Replace hard disk
3) Boot from install DVD, ask to restore from Time Machine back up
4) Connect USB drive containing back up directly to upgraded machine
5) Computer restores from back up
6) Reboot upgraded computer when finished
7) Return USB drive to network
8) Start Time Machine

It took a long time to process all the files and said that it had to write everything but in fact it only did an incremental backup.

I didn't have to do anything from this hint. I took a copy of the sparseimage before I connected the upgraded computer to compare and the change of UUID had already been done (I assume when the restore had been done).

The important point though - that nearly got me (and why you should have a back up of the back up) - is that you MUST have enough space on the Time Machine volume to do a COMPLETE backup. It won't do one but it will insist on having the space to do so. If there isn't enough space it will keep deleting old back ups until there is space. This could be every back up until the latest one!

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