http://askubuntu.com/questions/198570/files-backup-utility-with-incremental-backups-that-would-keep-backup-device-clea http://qiita.com/bunzaemon/items/6f55d7da12d2b6bd0436 http://zettai-non-sugar.blogspot.hk/2009/10/rsync-nas-samba.html h…