rsync

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

Usage:

rsync -azcuP /path/to/folderOrFile hostname:/path/to/remoteDir

options explain:

option	description
-a, –archive	archive mode; equals `-rlptgoD` (no -H,-A,-X)
-z, –compress	compress file data during the transfer
-c, –checksum	skip based on checksum, not mod-time & size
-u, –update	skip files that are newer on the receiver
-P	same as `–partial –progress`

Another useful options:

option	description
–exclude=PATTERN	exclude files matching `PATTERN`
–delete	delete extraneous files from destination dirs
-n, –dry-run	perform a trial run with no changes made