10-18-2011
Whether my opinion is valid really depends on your needs.
The things I really need when I back up a server are /var/, /etc/, and /opt/. Anything else can be regenerated.
Partition structure has little to do with directory structure. Backing up entire filesystems may preclude restoration to anything but a very similar machine.
Data files and system files really don't belong together. System files and utilities change rarely and on a regular schedule, data files change often.
Many daemons have ways to lock their datafiles for backup without shutting down the system.
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