On mac, when you copy ur backed up id_rsa from other computer, it will show an error
permissions 0644 for xxx.git are too open
This means too danger to it has this permission. In order to fix it, just make sure you are in directory .ssh, then change permission back to 0400. Boom~~
Terminal
cd .ssh
chmod 400 id_rsaReferences
1. https://stackoverflow.com/questions/29933918/ssh-key-permissions-0644-for-id-rsa-pub-are-too-open-on-mac/29948797
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