Backing-up iPad onto iMac via iTunes
I am attempting to backup my 7 year old iPad (Model 329B/A) onto my 'late 2013' iMac (running Sierra version 10.12.6) via iTunes
iTunes is up to date on Mac.
The sync will not get past stage 2 of 5 then I hear an audible chiming from the iPad with a flickering battery percentage icon followed a little while later with a pop up message on the Mac advising that the back-up has timed out. This has happened several times using alternative USB ports on the rear of the Mac.
Any suggestions from the Community why this should be?
Thanks