Hello,
Indeed the replication is only possible with StoreOnce Backup Systems (either hardware with Catalyst license or VSA which include the catalyst license)
Again, you have understand, any object copy perform from/to a storeonce software store will result of data being rehydrated.
It is still the case in 9.04
You can't transfer without rehydrating from SOS (StoreOnce Software) to a remote Store but you can transmit the data deduplicated (but this is not replication as the data will be rehydrated, then deduplicated again).
To achieve that, you must create a server side gateway located on your remote site for your central site catalyst store.
It works great for small amount of datas but can be time consuming for large amount of datas.