sudo apt-get install vim
备份原镜像源定义文件
sudo cp /etc/apt/sources.list /etc/apt/sources.list.old
修改镜像源定义文件
sudo vim /etc/apt/sources.list
deb http://mirrors.aliyun.com/raspbian/raspbian/ jessie main non-free contrib
添加btsync
sudo vim /etc/apt/sources.list.d/btsync.list
deb http://debian.yeasoft.net/btsync jessie main contrib non-free
deb-src http://debian.yeasoft.net/btsync jessie main contrib non-free
更新
sudo apt-get update

sudo apt-get install btsync

http://raspberrypihelp.net/raspberry-pi-bittorrent-sync-bitsync/