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Re: Using Snow Leopard for development (was: NSString Retain Count of 2147483647)
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Re: Using Snow Leopard for development (was: NSString Retain Count of 2147483647)


  • Subject: Re: Using Snow Leopard for development (was: NSString Retain Count of 2147483647)
  • From: Greg Guerin <email@hidden>
  • Date: Sun, 26 Jul 2009 13:57:25 -0700

Hamish Allan wrote:

> First, I partition my hard drive into three partitions:
> Beta
> Production
> Data

I'm just about to proceed with a multi-partition installation like
this, but I'm wondering about how it will interact with Time Machine.
Can I use the same TM volume for both Beta and Production?

Yes, if the TM disk has adequate free space. I've had multiple partitions on my Leopard machine since long before Leopard. It's currently 5 partitions (3 bootable, 2 not), and Time Machine has no apparent difficulties with it.


Time Machine will make a sub-dir for each volume-name it backs up. This sub-dir is located in the timestamp-named folder, which in turn is created under the machine-named folder in Backups.backupdb on the TM disk.

Because TM locates these sub-dirs by name (apparently), you may have to be careful about renaming the partitioned volumes. I'm pretty sure a renamed volume will lead to a full backup, which duplicates data rather than using space-saving hard-links. All my partitions have lots of data, so I'm reluctant to perform this experiment myself, but on a partition with very little data, it would be worth a little experiment.

TM's exclusion list stores alias-data (apparently) for each excluded volume, so renaming an excluded volume may not cause its data to be backed up.

As with anything undocumented and only determined experimentally, any of this may change at any time.

  -- GG
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