# scp -c arcfour256 -r 192.168.10.11:/work/backups/ /work/backups/
rsyncも下記のようにやれば、早くなる
# rsync -av -e "ssh -c arcfour256" 192.168.10.11:/work/backups/ /work/backups/
http://blog.n-z.jp/blog/2014-08-11-openssh-arcfour256.html
http://d.hatena.ne.jp/rx7/20101025/p1
# rsync -av -e "ssh -c arcfour256 -i key" 192.168.10.11:/work/backups/ /work/backups/