原来一直用tar、sync等软件实现备份。需要些脚本还要找一台其他服务器进行同步。现在有了DROPBOX这个网站提供的服务，一切都变容易了。

DROPBOX网站：

www.dropbox.com

DROP功能：

偷懒直接把官方介绍帖过来了。主要就是免费提供2G的同步空间，可以自动同步文件并保留文件的历史版本

Dropbox Features

File Sync

Dropbox allows you to sync your files online and across your computers automatically.

• 2GB of online storage for free, with up to 100GB available to paying customers.
• Sync files of any size or type.
• Sync Windows, Mac and Linux computers.
• Automatically syncs when new files or changes are detected.
• Work on files in your Dropbox even if you're offline. Your changes sync once your computer has an Internet connection again.
• Dropbox transfers will correctly resume where they left off if the connection drops.
• Efficient sync - only the pieces of a file that changed (not the whole file) are synced. This saves you time.
• Doesn't hog your Internet connection. You can manually set bandwidth limits.

File Sharing

Sharing files is simple and can be done with only a few clicks.

• Shared folders allow several people to collaborate on a set of files.
• You can see other people's changes instantly.
• A "Public" folder that lets you link directly to files in your Dropbox.
• Control who is able to access shared folders (including ability to kick people out and remove the shared files from their computers).
• Automatically create shareable online photo galleries from folders of photos in your Dropbox.

Online Backup

Dropbox backs up your files online without you having to think about it.

• Automatic backup of your files.
• Undelete files and folders.
• Restore previous versions of your files.
• 30 days of undo history, with unlimited undo available as a paid option.

Web Access

A copy of your files are stored on Dropbox's secure servers. This lets you access them from any computer or mobile device.

• Manipulate files as you would on your desktop - add, edit, delete, rename etc.
• Search your entire Dropbox for files.
• A "Recent Events" feed that shows you a summary of activity in your Dropbox.
• Create shared folders and invite people to them.
• Recover previous versions of any file or undelete deleted files.
• View photo galleries created automatically from photos in your Dropbox.

Security & Privacy

Dropbox takes the security and privacy of your files very seriously.

• Shared folders are viewable only by people you invite.
• All transmission of file data and metadata occurs over an encrypted channel (SSL).
• All files stored on Dropbox servers are encrypted (AES-256) and are inaccessible without your account password.
• Dropbox website and client software have been hardened against attacks from hackers.
• Dropbox employees are not able to view any user's files.
• Online access to your files requires your username and password.
• Public files are only viewable by people who have a link to the file(s). Public folders are not browsable or searchable.

Mobile Device Access

The free Dropbox iPhone app lets you:

• Access your Dropbox on the go.
• View your files on your iPhone or iPod Touch.
• Download files for offline viewing.
• Take photos and videos and sync them to your Dropbox.
• Share links to files in your Dropbox.
• View interactive photo galleries.
• Sync downloaded files so they're up-to-date.

A mobile-optimized version of the website is available for owners of Blackberry phones and other Internet-capable mobile devices.

Linux下安装

如果你的Linux服务器安装了Xserver和桌面，完全可以安装官方的指南来安装。但是因为一般的VPS都内存小得可怜，不会奢侈到安装桌面，所以下面主要介绍在没有安装桌面系统的命令行Linux下安装步骤。

关于安装方法的内容转帖自http://lazyhack.net/install-dropbox-in-vps/

1、登陆进VPS或者是服务器，进入用户目录

2、下载dropbox的客户端，要For linux那个而非For Nautilus的

这里我是在http://lazyhack.net/install-dropbox-in-vps/文档中找到的地址，官方网站找了半天都是Nautilus的版本

32位下载地址 http://www.dropbox.com/download?plat=lnx.x86

64位下载地址 http://www.dropbox.com/download?plat=lnx.x86_64

我这里用的32位系统，所以下载32位客户端

3、解压

4、下载dbmakefilelib.py并运行

如果出现以下信息，说明它运行正常

dropboxd ran for 15 seconds without quitting - success?

看到它的提示了吗，Dropbox已经启动了，让你运行15秒后再退出，这个过程就是dropbox生成机器信息并保存到db文件的，其实对于国外的vps来说几秒时间就够了，我们ctrl－c将其退出，完成接下来的步骤
 

5、进入Dropbox的dot目录导出机器信息

我们会在导出的信息中看到如下的一串字符

INSERT INTO "config" VALUES(4,'host_id','VmQ0NWFlMTdmYmQ3OGYzMzgyOTM0NWMzN2Q1MGFkOTIzCnAxCi4=
');

这个host_id就是机器的唯一标识，我们需要用它来跟自己的账户进行匹配，不过在这之前还有个工作需要做，因为上面的那长串字符很明显可以看出 是用base64编码后的结果，我们得先把它解码再说，注意这里Dropbox耍了个小花招，这串字符串前面的那个”V“，是无用的，我们在解码后的把它 忽略掉
 

6、将base64字符串解码

我的结果是Vd45ae17fbd78f33829345c37d50ad923，忽略掉”V“，就是d45ae17fbd78f33829345c37d50ad923

7、将账户信息与机器信息绑定
这步很简单，只需要访问以下网址，并登陆
HOSTID替换成你刚才解码出来的那串字符就行了

https://www.dropbox.com/cli_link?host_id=HOSTID

8、建立dropbox的同步目录
dropbox的同步目录默认的是~/Dropbox

$ mkdir ~/Dropbox

9、运行，开始你的同步

$ ~/.dropbox-dist/dropboxd &

到这里dropbox就可以正常运行并同步了，文章标题说的是备份网站数据，那么我们就来使我们的网站数据能够同步到dropbox服务器上
其实很简单，就是建立符号连接而已，windows之前是没有这个功能的
比如要备份/var/www这个目录

cd ~/Dropbox
$ ln -s /var/www web_backup

这就可以了,或者要备份/etc目录

$ cd ~/Dropbox
$ ln -s /etc etc_backup

ok.发挥你的想象尽情的使用吧。
 

推广

如果你看过这篇文章后，打算也使用dropbox。那么你可以使用我下面的链接注册

https://www.dropbox.com/referrals/NTU4NDMyNzI5

采用这个链接注册，你会增加250M空间。注册后是2G，然后会给你再发封邮件告诉你已经提升到2.25G。而我也会增加250M空间。