As far as I know embalming and cremation are not being approved of by the Orthodox church. When the body dies it should be left in peace and only God can decide if it will stay incorrupt or will decompose — there are Saints whose relics have the skin on for ages. But this happens only by God’s will and for a reason that we do not know-may be it is a manifestation intended for unbelievers to start thinking. Cremation is not allowed as you cannot burn something that you cannot create. Anyhow, the good news is that at His Second coming, our Lord Christ will resurrect all bodies no matter what we have done to them in our ignorance. The resurrected bodies will be free of illnesses and defects.