It should be fairly simple, it will just pick up /opt/minepeon/etc/* and /opt/minepeon/var/rrd/*.rrd and allow you to restore them to a new version.
an older (April?March) build has the rrd file on a slightly different location
/opt/minepeon/http/rrd/*.rrd
the config files dir is the same as Neil writes, in /opt/minepeon/etc/