Dave:

Thanks for pointing out the -H flag to preserve the hard links. That
seems like a Very Good Idea. I've been backed up many systems with the
method described and have yet to run into issues with hard links.

Your other options and cautions are not appropriate in the context I put
forth: "Boot to sda3, be root and and make a shadow of everything from
sda1 to sda3, maybe with..." Note that I am not advocating doing a full
backup of a live system here.

Your concerns would be valid if the hypothetical system were booted to
its normal root partition, sda1. Your mention of 

 mount -o bind / /mnt/root

causes me to suspect that you are confusing filesystem snapshots with
the unrelated "rsync with snapshots" method described at
http://www.mikerubel.org/computers/rsync_snapshots/

Again, thanks for pointing out the -H option to rsync.

George



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