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: 同步和RAID有啥区别？如果是同步到外置硬盘，和备份又有啥区别？

http://gengwg.blogspot.com/

不同设备之间的常用文件同步的需要：
经常在一堆电脑和移动设备之间搬运同样的文件，比如歌曲照片，最近常用到的文件；
经常折腾移动设备的人，每个设备各种rom工具和备份；
文件很大很多，网盘受带宽和空间限制，或者不想啥都放网盘；
不勤快的人，不会走哪都带着大移动盘（移动盘和设备之间仍然需要同步）；
不像raid再去提供另一份讲究可靠性的备份存储盘。

这里说的文件目录的同步就是维护这么一大堆常用镜像文件。
这个功能，其实主要就是在一对文件目录结构之间比较异同然后更新到一致。
其实这个功能在下面这些工具里已经重复存在，只是局限在单个应用内：
svn或者git之类的version control工具也可以用来干这个，但是那样会把存储空间时
间浪费在维护文件和目录所有变动过的版本上。
不同设备和OS可能有各自的同步工具，但不通用，或者不是开放所有内容同步。
网盘和本地目录之间的同步，也在做同样的工作。

之前楼上举的那些例子就是比较通用的同步层，只要能把移动或者网络存储map成本地
盘，就可以互相自动更新，不管具体都什么设备，位置和连接。

另外发现有些android手机接windows的时候开始去掉映射成本地盘的disk mount，整出
一个MTP（Media Transfer Protocol）的幺蛾子，
http://en.wikipedia.org/wiki/Media_Transfer_Protocol
结果大家只好到处找工具把it改回usb mass storage...

【 在 syforum (syforum) 的大作中提到: 】
: 同步和RAID有啥区别？如果是同步到外置硬盘，和备份又有啥区别？

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