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Use multiple drives with Time Machine
Authored by: barefootguru on Aug 21, '12 01:34:24PM

Tantali/kitus: the exclusion list is shared across all backup drives.

The logic is simple: you add multiple drives to the Time Machine prefs, and Time Machine will rotate between all drives which are available. It's automatic when the hourly trigger time is reached: TM will switch to the drive with the oldest backup. If a drive is unavailable TM will choose the next oldest one.

(I'm occasionally still seeing issues when a drive first becomes available—sometimes Mountain Lion needs a reboot for it be used.)

e.g. I have 4 drives, A, B, C, and D. A & B are currently offsite, so one hour TM will back up to C, the next hour will be D. When I plug in A, TM will take 3 hours to cycle between them.

kitus: to exclude the NAS you'd need to make it unreachable, but not sure why you'd want to—2 backups are better than 1.



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Use multiple drives with Time Machine
Authored by: barefootguru on Sep 17, '12 03:04:54PM

Instead of 'volume with oldest backup' the logic appears to be 'volume with oldest *attempted* backup'. Most of the time this is the same, but if a backup fails that volume will miss its turn and have to wait in the cycle again—which makes sense—if an error is preventing a backup to a particular volume you don't want all backups to wait on that volume.



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