Use the rsync command to synchronize data

Use the rsync command to synchronize data-Linux Enterprise Application-Linux server application information. The following is a detailed description. Considering server data security, I want to add a backup server to achieve better redundancy through data synchronization.
In linux, there is a very good command rsync to implement differential backup. The following describes its usage:

▲Suitable system: Hongqi DC 4.1 or 5.0, or other linux and FreeBSD systems
▲Test environment: Hongqi DC 5.0

1. Use rsh or ssh commands

In the absence of an rsync server, we can use the rsync command to directly perform fast differential backup:

CODE: Command Format: # Rsync [option] Destination path of the Source Path Where: [Option]: A: Use the archive mode, which is equal to-rlptgoD, that is, keep the original file permission. Z: Indicates compressed data during transmission. V: display to the screen E: Use a remote shell program (rsh or ssh can be used) -- Delete: Precisely saves copies. files deleted from the source host are also deleted from the target host. -- Include = PATTERN: do not exclude files or directories that conform to PATTERN. -- Exclude = PATTERN: exclude all files or directories that conform to the PATTERN. -- Password-file: Specifies the password used for rsync server user authentication. The Source Path and target path can be in the following format: Rsync: // [USER @] Host [: Port]/Path <-- rsync server Path [USER @] Host: Path <-- another representation of rsync server [USER @] Host: Path <-- remote Path LocalPath <-- local path