Clone hard drive in a file with high compression

 dd command is use to copy        xz has the capacity to compress
  | the source disk and its       the data into highest compression
  | path is mention under          ratio.
  | "if" switch.   /	            |
  |          _____/                 |
  |         /                       |      -9e is the highest compression level
  |        /                        |      which require more resource compare
  |       /\                        |      to other levels.
  |      /  \                       |     /
  |     /    \                      |    /
  |    /      \                     |   /
# dd if=/dev/sdX status=progress | xz -9e > sdX.img.xz
                 /                        | /
                /                         |/
               /                          |
  progress option in status         redirect output
  switch will show the current      into a file in
  progress status of data write     .xz extenstion
  on standard output.               that will help
                                    to identify
                                    when it is
                                    require to
				    decompress.

{ How to restore from same file. }

 xzcat decompress xz format          progress option in status
 file in standard output.            switch will show the current
   |                                 progress of data writing on
   |   Backup file, which is         target device along with the
   |   source file to restore.       data transfer speed.
   |          |                         /
   |          |                        /
   |          |                       /
# xzcat sdX.img.xz | dd of=/dev/sdX status=progress
                  /   \  |
                 /     \ |
 Pipe to forward the    \|
 standard output to      \
 next command i.e. dd    dd command will copy
                         data from standard input
                         and dump it into target
                         device which path is
                         mention in "of" switch.