互联网创业的准备数据备份_MySQL
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只要是创业，即使是很小规模的个人网站微型创业，也要注意数据备份，免得一夜回到过去……
数据出问题的常见原因：误操作导致缺损（无法修复）、服务器临时故障宕机（需等待服务器恢复正常）、服务器故障导入缺损（无法修复）、被入侵。
近期云主机故障如下图，更多故障请参考：http://www.enet.com.cn/article/2012/0730/A20120730142946.shtml
个人网站数据丢失案例：
需要备份的数据：最重要的是代码、数据库、上传的文件（用户头像、产品图片等），其次是软件配置（mysql、apache等）。
代码的备份方法很简单：
使用代码库（svn、git），每次上线之前，在本地测试通过，打tag，提交到代码库，然后上线。
如果服务器故障丢失代码，从代码库里取出最新的tag即可。
单台数据库的备份方法：
如图所示，开发者一般是内网IP，服务器无法直接发送过来，所以服务器crontab定时备份压缩到本机，开发机crontab定时去下载（定时开机即可，不用一直开机）。
crontab mysqldump较为简单，不再详述，请参考：http://www.cnblogs.com/bruceleeliya/archive/2012/05/04/2482733.html
上传的文件：
1台时：crontab定时打包目录，定时下载。
多台时：多个web server同步冗余，无需再单独备份。
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