Encrypting Backups 
Prerequisites
SAP Cryptolib (only available for SAP systems)
You have created a private-public key pair using sapgenpse.
For more information about sapgenpse and SAP Cryptolib, see Using the SAP Cryptographic Library for SNC.
Procedure
When creating the backup template for your backup, specify the encryption algorithm and the private key owner in the backup template properties.
Create the backup using this backup template.
More Information
For an example scenario, see Database Administration, Encryption