In case I restore my phone or change for a brand new.
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Do you have your iTunes backup encrypted? I know that if it is, it can save things like Health data. – SilverWolf Nov 4 '18 at 16:57
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Wi-Fi passwords on iOS are stored in the keychain, which is only part of an iTunes backup if encrypted backups are enabled. If you enable encrypted backups, a future backup of the device using iTunes will contain the Wi-Fi network password. Passwords cannot be added retroactively to backups. Backups to iCloud will always contain the keychain containing the Wi-Fi network password.
Encrypted iTunes backups can include information that unencrypted iTunes backups don't: Wi-Fi settings
About encrypted backups in iTunes - Apple Support
To enable encrypted backups, check the checkbox on the device page in iTunes.
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I have to say that this is a very useful response put in a very elegant way, congratulations, it is very satisfaying. – Adriano Nov 4 '18 at 22:58
