In general, yes - if the physical drives corresponding
to (say) hda and hdb are identical (and even in
a number of cases where they aren't) you can boot
from hdb (or a partition thereof) after saying (the
equivalent of)
dd if=/dev/hda of=/dev/hdb
...and I'd recommend adding parameters like
bs=10240k
...to use a copy buffer of 10Mb so you don't die of
old age while it's underway. Many other factors come
into play here, like whether your BIOS is willing to
consider the device in question as a boot device,
LILO considerations, etc, etc. But it does work
in principle.
Same goes for partitions on the same device - I'm
currently running with my root device as /dev/hda2
being a dd'd copy of my hda4, which was my previous
root partition.
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