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Back in April, 2007, Nathaniel Gray introduced Backup Bouncer, a suite of tests that can be used to evaluate a backup solution's ability to preserve HFS+ filesystem metadata. Since then, I have discovered a few bugs in the test suite that would prevent it from accurately reporting results on various platform:OS combinations. I also identified some areas where Backup Bouncer could do a bit more, so I fleshed out some of the tests to be a bit more thorough. Finally, I also added support for testing the support of HFS+ filesystem compression, a feature added in Snow Leopard. See also this report of the Backup Bouncer results for Carbon Copy Cloner.

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Squeeze is a background file compressor, which uses the new HFS-compression technology in Snow Leopard to transparently compress the folders you configure it to process. Mac OS will read those files normally, they will just take less disk space. How does it work? Just select some folders to compress and Squeeze will silently work in the background to compress the files contained on those folders, regaining disk space. Whenever you use any of those files, Snow Leopard will read it like any other file in the system - it will simply take less space.