How to recover lost backup from iTunes.
How can I get my backup from iTunes.
I search in iTunes but it’s not there. How can I find that backup again.
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See this. Locate backups of your iPhone, iPad, and iPod touch - Apple Support
Understand, that depending on the iOS of the backup, and the iOS of what you are trying to restore to, it may not work. You cannot restore a newer iOS backup to a device running an older version of iOS. That won't work.