Ive just been thinking when i played mah orc rogue (trololo) what the highest possible multiplyer of damage on a backstab (daggers ofc) can be.
So:
x2 from the Armsman 5/5 (One handed damage perk) = x2 total
x15 from Assassin's Blade = x30 total
x2 from Berserker = x60 total
x3 because a dual dagger power attack is 3 hits... = x180 total... WAIT WHAT?
Yep... a backstab that deals "almost" two hundred times your normal damage...