At the moment i have 2 bikes parked at the front of my house, both are alarmed, 1 has a disc lock on the rear wheel, both are chained to a railing with heavy duty chains and padlocks through the frame and rear wheels, both are covered and a further wire type lock through the cover around the front wheels and through the railings. When i go out depending on which bike i go on, one is mainly just the disc lock and sometimes with the chain if parked up out of sight for some time like in town, the other as it has drum brakes i usually take the chain, and try and chain to something solid. I would fit some kind of anchor in your garage and chain it with a couple of chains, it might be a pain but it is more of a pain to have it nicked, but no amount of security is theft proof, if they want it they will have it