быстрый, универсальный, удаленный (и локальный) инструмент для копирования файлов (a fast, versatile, remote (and local) file-copying tool)
INTERNAL OPTIONS
The options --server and --sender are used internally by rsync,
and should never be typed by a user under normal circumstances.
Some awareness of these options may be needed in certain
scenarios, such as when setting up a login that can only run an
rsync command. For instance, the support directory of the rsync
distribution has an example script named rrsync (for restricted
rsync) that can be used with a restricted ssh login.
