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10.5: Reconnect Time Machine backup after drive swap
Authored by: monkeybagel on Jun 22, '11 06:44:28PM

Thank you to the OP for this hint. I am on 10.6.7 and have been trying to reconnect my external FW400 drive to Time Machine after a restore from the same drive (after trying the Lion DP4 preview). I performed a Time Machine restore booting from the 10.6.0 DVD media and all seemed to go well. The system is functioning correctly as expected, and I extracted fsaclctl from a 10.5.3 DVD I had. All seems to go well and Time Machine does not complain about a UUID mismatch, however I am still seeing what appears to be a full backup. The drive in question has about 580GB free before starting the Time Machine backup out of 1TB. It then calculates the initial backup and estimates 209GB will be backed up, which equates to the data on my entire system. Although the backup is running very slow, it is running currently with no errors. I have seen where people have posted that it is normal for Time Machine to estimate the wrong size during the first backup and that it essentially sorts it out on its own, but I don't seen any clarification as to when this happens and how it is observed. For example, should I see the number decrease in System Preferences? Right now, I am seeing 113.73GB of 209.08GB backed up, and the 209.08 has not changed. Will this change before it gets finished? Also, the free space on the FireWire drive has went down by 113GB so it appears to be using that amount and not doing a delta backup. Just wondering what to expect and how to confirm that it has indeed performed a delta backup.

Thank you

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