New formatted hard drive plugged into Extreme - yes, formatted Mac Journal. The new drive is seen on network, but it cannot be applied as a Time Machine function on my iMac.
I edit the Extreme on Airport utilities - add disks. The hard drive is shown. I enable file sharing, secure shared disks with device password - and update. Nothing happens from that point onwards.
Reading a number of other questions from people with similar problems on other sites, it seems that although this feature is advertised and promoted by Apple in the instruction booklet (page 13), Apple have backed away from this facility post production. Maybe it is not reliable enough in its present form?
I am very disappointed about this as I had intended to use the Extreme to back up several devices in my home and office.
Any other ideas would be welcome.
Thanks