With OS X 10.6 .3 it’s not possible anymore to limit the size of TM backups by precreating the TM image with a fixed size.

With the OS X 10.6.3 Update Apple has introduced a new feature into TimeMachine: as soon as TM starts up and mounts the AFP volume with the TM image, it checks whether the image size matches the sizes of the underlying AFP volume. If the image is smaller, it gets resized to the size of the AFP volume. Therefore it’s not possible anymore to limit the size of TM backups by precreating the TM image with a fixed size.

The upcoming release of Netatalk 2.1 will have a new volume option volsizelimit which can be used to present the AFP client a fake volume size.

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