I have applied encryption to my directroeis at rest with help of Hadoop KMS. With help of Hadoop key and hdfs crypto commands, I can able to create keys, zones, ...etc. Need clarification and documentation on below. How to un-encrypt a file or directory? After Creating Keys, where it will store? Is there any way we can take backup of keys? How to restore keys after delete keys? After delete existing keys' is there any way can we use the backup keys to replace with existing keys? If restore mechanism in place. Thanks Ravi.