An image forming apparatus performs, when a power-on operation has been subsequently performed after a power-off operation, a first snapshot developing process regardless of presence or absence of a change related to a device configuration of the image forming apparatus, the first snapshot developing process being performed such that first partial data (evacuation object information about a common device group in various device configurations) of snapshot data are written back from a nonvolatile storage to a volatile storage. In the case where the power-on operation has been performed and it is detected that there is no change related to the device configuration, a second snapshot developing process is also performed such that the second partial data (evacuation object information about a non-common device group whose presence or absence is changeable in the various device configurations) of the snapshot data are written back from the nonvolatile storage to the volatile storage.