About Optimization Features : About the RiOS data store encryption settings
  
About the RiOS data store encryption settings
You enable RiOS data store encryption under Optimization > Data Replication: Data Store. Under General Settings, this configuration option is available:
Data Store Encryption Type
Specifies one of these encryption types from the drop-down list. The encryption types are listed from the least to the most secure:
None disables data encryption.
AES_128 encrypts data using the AES cryptographic key length of 128 bits.
AES_192 encrypts data using the AES cryptographic key length of 192 bits.
AES_256 encrypts data using the AES cryptographic key length of 256 bits.
Click Save to save your settings, and then select Clear Data Store on Reboot and reboot the appliance.
You must clear the RiOS data store and reboot the optimization service on the appliance after enabling, changing, or disabling the encryption type. After you clear the RiOS data store, the data cannot be recovered. If you do not want to clear the RiOS data store, reselect your previous encryption type and reboot the service. The appliance uses the previous encryption type and encrypted RiOS data store.