使用svnsync备份很简单，步骤如下： 
一、在备份机上创建一个空库：svnadmin create SMP 
二、更改该库的钩子脚本pre-revprop-change（因为svnsync要改这个库的属性，也就是要将源库的属性备份到这个库，所以要启用这个脚本）: 
cd SMP/hooks; 
cp pre-revprop-change.tmpl pre-revprop-change; 
chmod 755 pre-revprop-change; 
vi pre-revprop-change; 
将该脚本后面的三句注释掉，或者干脆将它弄成一个空文件。 
三、初始化，此时还没有备份任何数据： 
svnsync init file:///home/backup/svn/svnsync/SMP/ http://svntest.subversion.com/repos/SMP 
语法是：svnsync init {你刚创建的库url} {源库url} 
注意本地url是三个斜杠的：/// 
四、开始备份： 
svnsync sync file:///home/backup/svn/svnsync/SMP 
这是就一个个版本进行备份了。 

附录： 
可能的报错一： 
Failed to get lock on destination repos, currently held by 'bug1.corp.scmbbs.com:0c424c20-2e3b-0410-bd34-7fdd53c25d02' 
Failed to get lock on destination repos, currently held by 'bug1.corp.scmbbs.com:0c424c20-2e3b-0410-bd34-7fdd53c25d02' 
Failed to get lock on destination repos, currently held by 'bug1.corp.scmbbs.com:0c424c20-2e3b-0410-bd34-7fdd53c25d02' 
Failed to get lock on destination repos, currently held by 'bug1.corp.scmbbs.com:0c424c20-2e3b-0410-bd34-7fdd53c25d02' 
Failed to get lock on destination repos, currently held by 'bug1.corp.scmbbs.com:0c424c20-2e3b-0410-bd34-7fdd53c25d02' 
Failed to get lock on destination repos, currently held by 'bug1.corp.scmbbs.com:0c424c20-2e3b-0410-bd34-7fdd53c25d02' 
Failed to get lock on destination repos, currently held by 'bug1.corp.scmbbs.com:0c424c20-2e3b-0410-bd34-7fdd53c25d02' 
Failed to get lock on destination repos, currently held by 'bug1.corp.scmbbs.com:0c424c20-2e3b-0410-bd34-7fdd53c25d02' 
Failed to get lock on destination repos, currently held by 'bug1.corp.scmbbs.com:0c424c20-2e3b-0410-bd34-7fdd53c25d02' 
Failed to get lock on destination repos, currently held by 'bug1.corp.scmbbs.com:0c424c20-2e3b-0410-bd34-7fdd53c25d02' 
svnsync: Couldn't get lock on destination repos after 10 attempts 
这个时候可能属性被锁了，删掉属性： 
svn propdel svn:sync-lock --revprop -r0 file:///home/backup/svn/svnsync/SMP 
删除成功后，再试一遍基本就可以了。 
如果反复操作都是同样错误的话，有可能是你的svn安装的有问题，重新安装一遍就好了，俺就是这样。 

可能报错二、 
svnsync: REPORT request failed on 'http://svn1.subversion.com/repos/Relevance' 
svnsync: The requested report is unknown. 
这是因为你源库的版本太低了，svnsync所需要的函数Report是svn1.4后加入的。没办法，对你的库进行升级后才能备份。
 

由于执行svnsync sync file:///home/backup/svn/svnsync/SMP 过程中容易出现错误一，避免中途人工干预，我写了一个脚本，来自动修复错误。脚本里面的路径自己来修改吧，我的环境是本地备份到另外一个硬盘。

 

1. [root@smb svn_bak]# cat svnsync.sh  
2. #!/bin/bash  
3. while (:)  
4. do 
5.         svnsync sync file:///svn_bak/svnbak/  
6.         if [ $? != 0 ]  
7.         then  
8.         svn propdel svn:sync-lock --revprop -r0  file:///svn_bak/svnbak/  
9.         fi  
10.         sleep 60  
11. done  

本文转自 fenghao.cn 51CTO博客，原文链接：http://blog.51cto.com/linuxguest/593131，如需转载请自行联系原作者