备份大目录 tar 比 scp 快
只限于文件小而多的情况，传输单个大文件两者应该是一样地 备份，从远端，到本地 % ssh someone@somewhere "cd /my/big/folder; tar cvzf - ." > /my/backup.tgz 还原，从本地，到远端 % ssh someone@somewhere "tar xvzf - -C /my/new/directory/" < /my/backup.tgz 备份，从本地，到远端 % cd /my/big/folder; sudo tar cvzf - . | ssh someone@somewhere "dd of=/my/backup.tgz" 还原，从远端，到本地 % ssh someone@somewhere "cat /my/backup.tgz" | tar xzvf - -C /my/new/directory/