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
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
what can I do if I can't remember my password to restore a backup in my phone from my computer