Freezing your leftover soup in muffin tips helps you get through busy weeks that leave no time for cooking. Or people who make giant pots of soup before realizing they can't finish a giant pot of soup. You may want to use a bigger tin than mine. [Tip from Apt Therapy]
I froze homemade miso soup. The tofu made it through just fine, though I imagine some ingredients would be more freezer-tolerant (ex. carrots).