Hi guys, Ive got an 11" MBA and the newest 21.5" iMac, I am trying to setup timemachine on both of them to an external 1TB NAS drive on my network. The MBA, which I had before the iMac worked fine and still does, however Im now trying to get the iMac to back up to the same drive, but it just wont. It recognises the external HD as a place to back up and Ive created a sparse bundle file for it but when I click back up it just says "Making disk available" for ages with the loading bar thing. Help please!!