Encrypted backups work really fine. The Evolution skin handles very smoothly but I noticed something. In the Restore Backup panel, there is an option to Backup Decryption, and it allows to add a passphrase like Scheduling a Backup.
But; I think because of the ".enc" extension in the file, It does not list any files up in the Files area.
I guess it is because of the BETA. They added decrypting passphrase fields to the skin but Restoring an Encrypted Backup not yet implemented. So we have to manually decrypt the backup with openssl on our computer or on our server and then restore the backup.