Backup rifle? Always. Lat year my son-in-law did some the last minute sightin/checkout of the backup rifle and he shot it so well he decided to us it instead of his regular rifle.

The year before that I had scope problems, but did not bring a backup. I borrowed the guide's 350 RemMag.

If going on a drop-camp hunt, sometimes it is not possible to take a backup rifle, but that is where you really need one. I have never taken my 44mag revolver but I will from now on.

Backup sandwich? I always take one and backup candy bars also.