Getting to know rsync
The basic syntax for rsync is simple enough -- just run rsync [options] source destination to copy the file or files provided as the source argument to the destination.So, for example, if you want to copy some files under your home directory to a USB storage device, you might use rsync -a /home/user/dir/ /media/disk/dir/. By the way, "/home/user/dir/" and "/home/usr/dir" are not the same thing to rsync. Without the final slash, rsync will copy the directory in its entirety. With the trailing slash, it will copy the contents of the directory but won't recreate the directory. If you're trying to replicate a directory structure with rsync, you should omit the trailing slash -- for instance, if you're mirroring /var/www on another machine or something like that.
In this example, I included the archive option (-a), which actually combines several rsync options. It combines the recursive and copy symlinks options, preserves group and owner, and generally makes rsync suitable for making archive copies. Note that it doesn't preserve hardlinks; if you want to preserve them, you will need to add the hardlinks option (-H).
Another option you'll probably want to use most of the time is verbose (-v), which tells rsync to report lots of information about what it's doing. You can double and triple up on this option -- so using -v will give you some information, using -vv will give more, and using -vvv will tell you everything that rsync is doing.
rsync will move hidden files (files whose names begin with a .) without any special options. If you want to exclude hidden files, you can use the option --exclude=".*/". You can also use the --exclude option to prevent copying things like Vim's swap files (.swp) and automatic backups (.bak) created by some programs.
This and More at https://www.linux.com/news/enterprise/storage/8200-back-up-like-an-expert-with-rsync
