Squaw has backcountry.. you just have to know where to look. I would highly suggest being an incredible skier however, and definitly to carry a beacon, its fricken dangerous out there even if you do know where to look.
Be careful if you go behind sibera ridge tho, its all wilderness area out there and your fucked if you get caught.
If you want good backcountry, go to sugarbowl... you have backcountry for DAYS, and alot of it filters down to donner lake, if you know where to go.
Having a beacon is still a neccesity guys, dont ever forget that, it will save your asssssss.