I had to go through some hoops to get Apple on the phone. I went to Google to search the backup problem and the first thing I clicked on was on the Apple page - it didn't answer my prob but there was a form there to be connected instantly on the phone to a technician. I did the form, got a call, fixed the screen saver thing (which had gone back to its default settings) and then he switched me over to a Time Machine expert - when reconfiguring the Time Machine yesterday (and renaming it), it de-selected the device in the Time Machine backup. All I had to do was select the device, put in my password, and voila.