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About 15hrs ago I accidentally logged out of iTunes on our main Mac. I literally realized my error straight away, so logged back in immediately and didn't think anything of it.

I then redeemed two gift cards and all was good with the world, until I went to quit iTunes. I got a warning saying that iTunes was uploading to the music library and asking me if I really wanted to quit? I cancelled and let it continue because I was going to bed anyway.

But today my internet has been painfully slow at times and just now I wanted to chill out and watch Netflix. It was having a hard time connecting and buffering and then I remembered iTunes. So I went back to my Mac to quit it and got the same error! I cancelled it again and then clicked on the little activity icon to see the following:

enter image description here

At this rate I'll be waiting for days for all this to upload again.

I don't understand what's happening here? We have two Macs, two iPads and two iPhones. Does this mean accessing my music library has been compromised on all devices while I'm waiting for everything to upload again?

Surely if we're still logged in on all our other devices iTunes on the main Mac doesn't need to do all this again? I was only logged out for about half a minute.

My questions:

  • Do I need to wait for iTunes to finish?
  • If I quit iTunes, what does that mean for the other devices in the meantime?
  • If I quit iTunes and then launch it again, will it start uploading from the beginning again or will it continue form where it was?
  • Do you have Time Machine backups ? – lauhub Jan 6 '18 at 12:37
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It all depends on what service you have, be it iTunes Match or Apple Music. This looks more like you have iTunes Match therefore all of you music is accessible from any device. This would mean that Apple matches what's in your library with what apple already has in it's vast library and any music in your library that Apple doesn't have they upload to the cloud with some exceptions. If this is the case then I don't think iTunes is actually uploading because you've already got everything in the cloud. I think it's just matching things up.

Do I need to wait for iTunes to finish?

If I quit iTunes, what does that mean for the other devices in the meantime?

If I quit iTunes and then launch it again, will it start uploading from the beginning again or will it continue form where it was?

No need to wait for iTunes to finish. Your music should be accessible from your devices if you've already had the service.

Same goes for if you quit iTunes.

iTunes will continue from where it left off when you quit it. So don't feel like you can't shut it down or turn off the computer.

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I've never used iTunes for managing a cloud library before, but from my experience with anything cloud, it should be smart enough to pick up from where it left off. As you can see in the pictures you posted, it uploads them one by one. So you should have at least 120 songs already uploaded, which it will check for when it resumes. Otherwise, if you added just one more song to your vast collection, it would start all over. You can check devices that are connected to that account to see what songs already made it over if you want to see if it made any progress, but you should be perfectly fine.

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