I cannot find information on this online. I think iTunes runs a local or iCloud backup (whichever is configured and was used last) before installing the iOS update, but I am not sure.

  • One can see last backup date time in iTunes and and in iPhone too. Other than that, you can find the backup help page where if backup is explicitly mentioned, it should be done explicitly too. – ankii Oct 5 '19 at 4:26

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