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Rsync example.... 

rsync -abviuzP src/ dest/
  • -i turns on the itemized format, which shows more information than the default format
  • -b makes rsync backup files that exist in both folders, appending ~ to the old file. You can control this suffix with --suffix .suf
  • -u makes rsync transfer skip files which are newer in dest than in src
  • -z turns on compression, which is useful when transferring easily-compressible files over slow links
  • -P turns on --partial and --progress
  • --partial makes rsync keep partially transferred files if the transfer is interrupted
  • --progress shows a progress bar for each transfer, useful if you transfer big files
Someone suggest to use:    rsync -abuP
rsync synchronizes in one direction from source to destination. Therefore the following statement
rsync -avh --progress Source Destination
syncs everything from Source to Destination. The merged folder resides in Destination.
-a means "archive" and copies everything recursively from source to destination preserving nearly everything.
-v gives more output ("verbose").
-h for human readable.
--progress to show how much work is done.
If you want only update the destination folder with newer files from source folder:
rsync -avhu --progress source destination

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