How to use rsync for data backup under Linux

For all organizations and companies, data is the most important to them, and even for e-commerce, data is just as important. Rsync is a tool/software that backs up important data over the network. It is also a network protocol for synchronizing folders and files between systems over a network on Unix-like and Window-based systems. Rsync can copy or display directories and copy files. By default, Rsync listens on TCP port 873 and copies files through remote shells such as rsh and ssh. Rsync must be installed on both remote and local systems.

main benefits

rsync is:

Speed: initially will copy all the content between the local and remote. Next time, only the block or byte that changed is transmitted.

Security: Transport can encrypt data via the ssh protocol.

Low bandwidth: rsync can compress and decompress data blocks at both ends.

Syntax:

 
 #rsysnc [options] source path destination path

 Examples: 1 - Enable compression
 
 [root@localhost /]# rsync -zvr /home/aloft//backuphomedir
 
 building file list ... done
 
 .bash_logout
 
 .bash_profile< Br> 
 .bashrc
 
 sent 472 bytes received 86 bytes 1116.00 bytes/sec
 
 total size is 324 speedup is 0.58

 The above rsync command is used -z to enable compression, -v is visualization, and -r is recursive. The above is synchronized between the local /home/aloft/and /backuphomedir. 
 Example: 2 - Keep properties of files and folders
 
 [root@localhost /]# rsync -azvr /home/aloft//backuphomedir
 
 building File list ... done
 
 ./
 
 .bash_logout
 
 .bash_profile
 
 .bashrc
 
 
 
 Sent 514 bytes received 92 bytes 1212.00 bytes/sec
 
 total size is 324 speedup is 0.53

 Above we used the -a option, which preserves the owner and group, time Stamp, soft link, permissions, and run in recursive mode. 
 Example: 3 - Synchronous local to remote host
 
 root@localhost /]# rsync -avz /home/aloft/[email protected]:192.168.1.4:/share /rsysnctest/
 
 Password:
 
 
 
 building file list ... done
 
 ./
 
 .bash_logout
 < Li> .bash_profile
 
 .bashrc
 
 sent 514 bytes received 92 bytes 1212.00 bytes/sec
 
 total size is 324 speedup is 0.53

 The above command allows you to synchronize between local and remote machines. You can see that you are prompted to enter a password when synchronizing files to another system. When doing remote synchronization, you need to specify the username and IP or hostname of the remote system. 
 Example: 4 - Remote sync to local 
 
 [root@localhost /]# rsync -avz [email protected]:192.168.1.4:/share/rsysnctest//home /aloft/
 
 Password:
 
 building file list ... done
 
 ./
 
 .bash_logout
 
 .bash_profile
 
 .bashrc
 
 sent 514 bytes received 92 bytes 1212.00 bytes/sec
 
 total size is 324 speedup is 0.53

 The above command synchronizes remote files Go to the local. 
 Example: 5 - Find differences between files
 
 [root@localhost backuphomedir]# rsync -avzi /backuphomedir /home/aloft/
 
 building file List ... done
 
 cd+++++++ backuphomedir/
 
 >f+++++++ backuphomedir/.bash_logout
 
 >f+++++++ backuphomedir/.bash_profile
 
 >f+++++++ backuphomedir /.bashrc
 
 >f+++++++ backuphomedir/abc
 
 >f+++++++ backuphomedir/xyz
 
 
 
 sent 650 bytes received 136 bytes 1572.00 bytes/sec< Br> 
 total size is 324 speedup is 0.41

 The above command helps you find out the difference between a source or destination file or directory. 
 Example: 6 - Backup 
 The rsync command can be used to back up linux. 
 You can use rsync to schedule backups in cron. 
 
 0 0 * * * /usr/local/sbin/bkpscript &> /dev/null

 
 vi /Usr/local/sbin/bkpscript
 
 
 
 rsync -avz -e ‘ssh -p2093′ /home/test/[email protected]:/oracle/data/
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