You cannot use the backup. There is no way to use an encrypted backup if you cannot remember the password. See this, About encrypted backups on your iPhone, iPad, or iPod touch - Apple Support
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You cannot use the backup. There is no way to use an encrypted backup if you cannot remember the password. See this, About encrypted backups on your iPhone, iPad, or iPod touch - Apple Support
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what can I do if I can't remember my password to restore a backup in my phone from my computer