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10.5: Use multiple drives for Time Machine backups
Authored by: palahala on Jun 08, '09 02:28:43PM

As for the 10.5: Use multiple Time Machine disks for redundancy hint mentioned above: be sure to read its comments for more insight about, for example, the extended attribute com.apple.backupd.SnapshotVolumeLastFSEventID. Ars Technica also features a well-known technical article, explaining how Time Machine uses the logs maintained by fseventsd.

And for whoever is reading these comments (about using multiple drives) through deep links posted on some other sites: please note that these comments are part of a much longer story: 10.5: Repair Time Machine after logic board changes. (Reading the whole story you will learn many more details, like how you might run into "Volume at path /Volumes/TM does not appear to be the correct backup volume for this computer. (Cookies do not match)", and like selecting another drive for Time Machine (through System Preferences) might change the timestamp and contents of /var/db/.TimeMachine.Cookie as well.)

If you initially want to clone a drive to get your second backup drive, then see A Bigger Time Machine without Changing History.



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10.5: Use multiple drives for Time Machine backups
Authored by: palahala on Jun 10, '09 02:34:25AM
...but after cloning a Time Machine disk you may want to take the extended attribute com.apple.backupd.SnapshotVolumeUUID into account as well.

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