I agree with Rees with one exception. I use my knife to separate the backbone from the hind quarters. No saw needed. The backbone is not solid. It can be severed by working your knife between the vertebrates and its a lot cleaner than sawing and having bone fragments.

But heck, who cleans a deer themselves nowadays anyhow? My processor had rather people not skin them because of all the hair most folks leave on em. Pay to have it done.

If ya just have to cut the breast bone, limb trimmers work good too.