An electronic device includes a memory and a processor. The memory includes a data partition, a key storage partition, and a key backup partition. The processor operatively connected to the memory. The processor is configured to generate an encryption key with respect to at least one data folder generated in the data partition to store the encryption key in the key storage partition. The processor is also configured to store a backup encryption key equal to the encryption key, in the key backup partition. The processor is further configured to store an integrity file including a checksum of the encryption key in the key backup partition.