From a computational POV DNA damage should be trivial to repair. You have so many redundant copies in your body. Of course building a fault-free copy, creating

From a computational POV DNA damage should be trivial to repair. You have so many redundant copies in your body. Of course building a fault-free copy, creating stemcells from that and coaxing those into fixing any defects without causing cancer is still scifi, but not the physics-violating kind.