Okay, so it seems to have completed (even though it stuck for ages with 1hr44min left on restoring Applications for some reason). However, I have a new problem. All the Applications seem to be there & functioning except iTunes! It's there, and it's connected okay to the Library which is on a NAS RAID1 Array. I'm able to play any music or movie/TV show that I've ripped myself, but any item I bought on the iTunes store can't be played. Also, when I connected my iPod Touch to sync it up, I got a dialog box asking if I wanted to Authorise this computer for the Apps installed on the iPod. If I click on Authorise, it does nothing. I tried to access my account through iTunes, but the Account button and menu link do nothing (and I really mean nothing, no dialog, no beachball, nada).
I thought I'd try signing out of my iTunes account & signing back in, but now I can't even Sign In to my iTunes account. Again, the Sign In Menu link does absolutely nothing. No pop-up, no login option. It's also managed to de-authorise iTunes from my Audible account, where I have over 200 audiobooks, including some that are no longer on sale. I want to be able to access my media. HELP!!!!!!
Okay, scratch some of that. It appears that doing this weeks' El Cap update & restarting twice has cleared the iTunes password issue. It's still causing problems with Audible, where it's trying to get me to either authorise or de-authorise on the US (.com) site, instead of the UK (.co.uk) site, which of course won't fly. That'll take me some digging I guess.... I don't remember it all being this complicated previously when I used a Time Machine backup to migrate to a new mac before though. It's got a lot more complicated. I'm seriously thinking of stripping all the data off my iMac and onto another NAS so it can be recoverable by a Windows 10 machine as well as OSX. It's getting so that "It just works" is now more like "It works, just (and only after a lot of fiddling around)"...