Do I dare ask if anyone has yet tried backing up, with Bacula, a Mac OS X 10.7 "Lion" or "Lion Server"? John Siracusa of Ars Technica has written what appears to be one of the most detailed reports about Lion starting on this page with table of contents:

This subchapter heading strikes me as most important with respect to Bacula and OS X 10.7 titled "File system changes in Lion" with some notable highlights I've excerpted particularly about Core Storage and the new disc encryption system Apple has come out with which logically should not be a problem for Bacula backups given how transparent it is to "software" (one concern might be what *other* changes have taken place to the file system in Lion that Bacula might want to address, which changes have not been presented in Siracusa's Ars article?):

Nevertheless, there are some file system changes in Lion—some significant ones, in fact. The biggest is the introduction of Apple's first real crack at creating a logical volume manager: Core Storage.

...

Core Storage's purpose in Lion is discreetly hidden in the Logical Volume Family tier of the layer cake. Logical Volume Families don't just export Logical Volumes, they also contain properties that apply to them. One such set of properties in Lion enables full disk encryption.

...

Though Apple is using the name FileVault to brand this feature, it has absolutely nothing to do with the feature of the same name from earlier versions of Mac OS X. The earlier incarnation of FileVault encrypted an individual user's home directory by storing it in an encrypted disk image file. This presented all sorts of complications to common operations, and FileVault earned a horrible reputation for poor compatibility with existing software (including Apple's own, like Time Machine).

Lion's FileVault doesn't just encrypt users' home directories, and it doesn't use encrypted disk image files. Instead, it's Apple's implementation of whole disk encryption. This means that every byte of data that makes up the volume is encrypted. Furthermore, this encryption is completely transparent to all software (including the implementation of HFS+ itself) because it takes place at a layer above the volume format—a layer that application software does not see at all.

Having used a third-party whole-disk encryption product for years, I can tell you that this approach works amazingly well. 

- Hydro

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