"The iPhone is Synced with another library. Do you want to erase..."

My itunes library has a lot of music from my iPad. I want to move that music to my iPhone by managing my music "manually", but it says ""The iPhone is Synced with another library. Do you want to erase this iPhone and sync with this iTunes library?"
I read that I have to back it up, then go ahead and erase the phone, then you can add the music from the library to your phone. Is this true? Will it work?
I have backed up the phone to iCloud, but I'm worried still. How can I be SURE that I'll get everything back when I restore the phone after erasing it?
Thanks!

I'm afraid the LU suffix is a new one on me.
As long as you have all of the content in your library then that remove and sync warning shouldn't cause any loss of data, but it shouldn't be happening every time. It may pay to take the following steps to reset the connection between the two,
Backup device.
Restore as a new device.
Restore the backup made earlier.
Again, this assumes all content on the device is in your library. If that isn't the case see Recover your iTunes library from your iPod or iOS device first.
tt2

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