Cloudberry Labs have added Reduced Redundancy Storage (RRS) improvements to their CloudBerry online backup software.
RSS was introduced in version 1.5, but now in version 1.6 you can decide it you want it on the account or plan level with an an appropriate option added to the Compression and Encryption step.
This enables you to have several backup plans with different storage classes. For example, one with standard storage class for the data that under no account you can lose and another one with RRS storage class with the less important data.
More details on CloudBerry Backup for WHS is available from here.