Csync2 [1] is a tool for asynchronous ¯le synchronization in clusters. Asynchronous ¯le synchronization is good for ¯les which are seldom modi¯ed - such as con¯guration ¯les or application images - but it is not adequate for some other types of data

利用csync2+sqlite实现数据的高效实时的增量备份，相关目录及文件信息都存储在sqlite数据库中, 大大提升了同步的速率和效率;利用inotify触发式（实时）执行csync同步命令更新文件。