Restoring Garage Band demo song (Glide)

I accidentally saved it and it copied over the original song.

you'd have to reinstall GB (or perhaps use Pacifist to see if you can install just the demo songs)

I have messed around trying to re-create this drum sound but I cant even come close.

unfortunately those drums are actual audio recordings, so unless you had the same drums, same mics, same studio, and same engineer, it would be pretty tough to duplicate.

as i recall the Rhythm Section Jam Pack has a really nice sounding drum kit that doesn't even need too much tweaking, the "warehouse kit":

http://www.bulletsandbones.com/GB/PluginsApplesJamPacks.html