Fix section "Rsync installation" in 12.4.md

Author: DeepAnchor

en/12.4.md

@@ -12,20 +12,22 @@ But what about the cases where we did not backup our data to a cloud service, or
 
 ### Rsync installation
 
-rsync 's official website: http://rsync.samba.org/can get the latest version from the above source. Of course, because rsync is a very useful software, so many Linux distributions will include it, including the.
+You can find the latest version of rsync from its [official website](http://rsync.samba.org/can). Of course, because rsync is very useful software, many Linux distributions will include already have included it by default. 
 
-Package Installation
+Package Installation:
 
 	# sudo apt-get install rsync ; Note: debian, ubuntu and other online installation methods ;
 	# yum install rsync ; Note: Fedora, Redhat, CentOS and other online installation methods ;
 	# rpm -ivh rsync ; Note: Fedora, Redhat, CentOS and other rpm package installation methods ;
 
-Other Linux distributions, please use the appropriate package management methods to install. Installing source packages
+For the other Linux distributions, please use the appropriate package management methods to install it. Alternatively, you can build it yourself from the source:
 
 	tar xvf rsync-xxx.tar.gz
 	cd rsync-xxx
 	./configure - prefix =/usr; make; make install 
-	
+
+> Note: If want to compile and install the rsync from its source, you have to install gcc compiler tools such as job.
+
 <blockquote>Note: Before using source packages compiled and installed, you have to install gcc compiler tools such as job</blockquote>
 
 ### Rsync Configure