I have a sven saw that I've had for years - its the second one I've bought.  The first saw gave out - where the two dimples? stick out that hold the traingle in position, one bent or broke to where the saw would collapse.

Used to bring the Sven to Quetico, but we don't generally cut big logs for firewood (don't base camp, so generally only would gather enough smaller wood for a single campfire).
For the past 8 or 10 years or whatever, we just bring the little Gerber that has a blade that slides back into the handle - effective enought for clearing a way thru blowdown and for cutting some firewood, and only weighs 3.5 ozs or so - I'd think for a "backup" saw, that would be better as its smaller and lighter than the other options, but whatever.  I guess if you do all or most of your cooking over a fire, having a bigger/heavier duty saw as a backup would make sense, especially if you bring an axe for splitting the bigger stuff.