[muglo] back up HD
- From: Douglas Feick <dejl6@xxxxxxxxxxxxx>
- To: muglo@xxxxxxxxxxxxx
- Date: Fri, 24 Oct 2008 10:42:33 -0400
files, a problem was mentioned about even the back up failing
sometimes. I came across this note when looking into Carbon Copy
Cloner and thought either this or a similar problem may cause
difficulty when backing up files.
Even if you aren't using Carbon Copy Cloner, will a similar
problem with permissions and changing permissions cause problems when
backing up files with something like Superduper, or Time
Machine?....Doug
Installing Carbon Copy Cloner
Carbon Copy Cloner is distributed via a disk image -- all
documentation and required components are contained within the
application on this disk image. You may copy CCC to your Applications
or Utilities folder, or anywhere else you prefer.
Working with FileVault home directories
FileVault protects the contents of your home directory by enclosing
it in an encrypted disk image. When you log in, the encrypted disk
image is unlocked via your login and password and mounted for use as
your home directory. Mounted disk images pose an interesting problem
to incremental backup utilities. By simply being mounted and accessed
(e.g. via browsing the contents), the content of a disk image, and
thus the disk image file itself, is modified. If you run CCC while
logged in to a FileVault-protected account, there is a strong chance
that the FileVault disk image will be modified while it is being
backed up, resulting in a corrupted version of the disk image on your
backup volume. Also, because the contents of your FileVault-protected
home directory are technically on another volume, CCC will not back
up the contents of your home directory when backing up your root
filesystem (e.g. your boot drive).
For these reasons, you should either exclude your FileVault disk
image file from your backup routine while logged into a
FileVault-protected account (and set up a separate routine for
backing up the contents of your home directory), or you should only
run CCC while logged into an account that is not protected by
FileVault.
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