On May 2, 2009, at 7:49 AM, Rick Burnett wrote:
I have the previous generation Airport Extreme (not the latest) and have a macbook, a macbook air, and a macbook pro all backing up to a 1TB drive attached to it via USB.
This will work up to a point, but can be dangerous unless you take care. Time Machine works by creating a sparse image file on the backup drive for each machine you are backing up. The initial virtual size of the image file seems to be the same as that of the backup drive. This means Time Machine always thinks it has enough room in each individual image to fill the whole backup drive from each machine. Bad things happen after the sum of the actual sizes of the sparse image files reaches the size of the backup disk.
This is why Apple discourages you from backing up more than one machine to a single Time Capsule volume.
The only ways I know to do this are to either shrink the virtual size of the sparse image with hdiutil or partition the backup drive.
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