I am buying a new Xserve hopefully with 4 tb of data storage. I have an old xserve raid with 500 gb drives in it. I am told in total that the raid has 2.7 tb of data storage. I would like to use the old raid to back up the new xserve. What software / hardware will I need to get this going? Im guessing I would have to replace the 500 gb Hard drives with 1 tb drives. What software would be necessary to start an automatic backup schedule?