An apparatus comprises a memory slot mounted to a main board, an expansion slot mounted to the main board and electrically coupled to the memory slot, a backup power module receivable in the expansion slot, and a main power source electrically coupled to the expansion slot and the memory slot. During normal operation, the main power source supplies electrical power to the memory slot and charge the backup power module. In the event of power loss or main power source failure, the backup power module discharges electrical power to the memory slot.