In reply to bigrob:
folding wood saws work OK as well.
TtB: plastic dinnerplates can be used to shift snow as well as shovels, and smooth the roof.
'snow graves' or scrapes are a lot quicker and possibly warmer...but horrible to sleep in.
if you're cooking, have something to stand the stove on & someone clearing the cave airvents - have plenty! Our old leader used to insist on at least one person being outside in case of collapse..probably overkill!
Smooth the roof really carefully...you'll still get drips, mind
it's 20 years since i did it last and i still remember one collapsing on us while sleeping; no big drama in the end, but an 'interesting' few moments!!...