How hard is it to move/copy the Observium
config to a newly built machine?
Either you move the whole of /opt/observium + your mysql db +
cronjobs ,or you do a fresh install (think of the dependencies!),
import your database, copy your config.php and rrd directories, and
off you go.
Note: if you're moving from 32 to 64 bits, you're in for a world of
pain (thanks Tobi!)