I have two hard drives in a server and they are in a RAID 1. The partition is 33 GB and I have Ubuntu 12.04 LTS server installed. I have a working ISCSI target server with a mounted drive on the server /media/iscsi

I want a software service that will continually keep both the physical hard drives and the ISCSI hard drive exactly the same in case something goes horribly horribly wrong. Is there any software service that I can install and configure to do this, or am I stuck Rsyncing it every evening?

Thanks for your help