Restoring backups and effect on GRUB

[Kevin O'Gorman]

I'm working on backup scripts, and want to make sure I understand the
consequences of what I'm doing.  In particular, I have still not decided
how I'm going to back up my / partition: tar/dar or dd,
and I'm wondering what effect there is on GRUB if a partition is moved,
resized, or restored from a  tar/dar archive, because I'm thinking some of
the above operations would change where the kernel is.  I'm unclear about
how GRUB locates the kernel and any other boot files, and whether it can
follow the directory structure or if instead it knows the LBA blocks where
the files were originally stored.

Aside: most of the documentation addresses the benefits of some program
without always explaining any details of how those benefits are achieved.
I work best when I not only know what's going to happen but also know why
and how that happens.

Anyone have a clue?

++ kevin
-- 
Kevin O'Gorman
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