A physical computer system includes a processor and a memory configured to store instructions executable by the processor to implement a virtualization module, which in turn implements virtual machine(s) that execute an operating system distinct from any underlying operating system executed by the physical computer system. In response to a client request to initially perform a repeatable computation, the virtualization module instructs that the virtual machine(s) archive an original initial state of the repeatable computation, initially perform the repeatable computation, and archive an original terminal state of the repeatable computation. In response to a client request to repeat the repeatable computation, the virtualization module instructs that the virtual machine(s) be initialized according to configuration information indicated by the archived original initial state of the repeatable computation, and that the one or more virtual machines perform the repeatable computation to generate a new terminal state of the repeatable computation.