a fast, versatile, remote (and local) file-copying tool

-a, --archive
       This is equivalent to -rlptgoD. It is a quick way  of  saying  you  want  recursion  and  want  to
       preserve  almost  everything  (with -H being a notable omission).  The only exception to the above
       equivalence is when --files-from is specified, in which case -r is not implied.

       Note that -a does not preserve hardlinks, because finding multiply-linked files is expensive.  You
       must separately specify -H.

-x, --one-file-system
       This  tells rsync to avoid crossing a filesystem boundary when recursing.  This does not limit the
       user’s ability to specify items to copy from multiple filesystems, just rsync’s recursion  through
       the  hierarchy  of each directory that the user specified, and also the analogous recursion on the
       receiving side during deletion.  Also keep in mind that rsync treats a "bind" mount  to  the  same
       device as being on the same filesystem.

       If  this option is repeated, rsync omits all mount-point directories from the copy.  Otherwise, it
       includes an empty directory at each mount-point it encounters (using the attributes of the mounted
       directory because those of the underlying mount-point directory are inaccessible).

              If  rsync  has been told to collapse symlinks (via --copy-links or --copy-unsafe-links), a symlink
              to a directory on another device is treated like a mount-point.  Symlinks to  non-directories  are
              unaffected by this option.

-u, --update
       This forces rsync to skip any files which exist on the destination and have a modified  time  that
       is  newer than the source file.  (If an existing destination file has a modification time equal to
       the source file’s, it will be updated if the sizes are different.)

       Note that this does not affect the copying of symlinks or other special files.  Also, a difference
       of  file format between the sender and receiver is always considered to be important enough for an
       update, no matter what date is on the objects.  In other words, if  the  source  has  a  directory
       where the destination has a file, the transfer would occur regardless of the timestamps.

       This  option  is a transfer rule, not an exclude, so it doesn’t affect the data that goes into the
       file-lists, and thus it doesn’t affect deletions.  It just limits  the  files  that  the  receiver
       requests to be transferred.

-v, --verbose
       This  option  increases  the amount of information you are given during the transfer.  By default,
       rsync works silently. A single -v will give you information about what files are being transferred
       and  a  brief summary at the end. Two -v options will give you information on what files are being
       skipped and slightly more information at the end. More than two -v options should only be used  if
       you are debugging rsync.

       Note that the names of the transferred files that are output are done using a default --out-format
       of "%n%L", which tells you just the name of the file and, if the item is a link, where it  points.
       At  the  single  -v  level  of  verbosity,  this  does not mention when a file gets its attributes
       changed.  If you ask for an itemized list  of  changed  attributes  (either  --itemize-changes  or
       adding  "%i"  to  the  --out-format  setting), the output (on the client) increases to mention all
       items that are changed in any way.  See the --out-format option for more details.