In true Winter camping situations, I also take my pulk and don't mind a little extra gear.
I separate my day/hiking/camp clothes from my sleeping gear. If my day clothes are wet from snow, sweat, etc., I still want to have a set of sleep gear that I know is dry. This gives me a full set of backups both directions for when the emergency could be the weatherman was wrong (my most common emergency). I can add to my sleep setup with more clothes from my day gear and I can always wrap up in my quilts to add to my day gear. In all cases, for safety, I always want to have one more layer available than I need. This arrangement gives me many layers of safety.
Now if the emergency is the gear itself, it is harder to have one more available without taking double or triple gear which is unreasonable. As far as my hammock setup goes, I have straps and cordage that will likely be able to take care of issues with the suspension. I have tape that will likely address a rip in the tarp and if there is a total failure, it is the easiest thing to go without in the winter. Even if it snows, it will likely just build up on the top quilt if it is doing its job properly.
The hammock is really the one piece of gear that if it fails will be a big issue. My first alternative would be the gear hammock. Shorter and not as comfortable, but certainly serviceable. If that is not an option then I can always rely on my clothing layers and quilts to get me through the night(s) until I am back at base. Probably not comfortable and may not get much sleep, but certainly safe enough.
Injury is a much bigger concern to me than gear failure - much harder to take spare parts.
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