rsync

Usage:

# general usage:
rsync -avhuzP /path/to/src_folder/   username@serverIp:/home/username/path/to/dest_folder/

# other usages:
alias rsyncBackupCompareAttr='rsync -avhuz --progress --delete --log-file=rsyncBackupLog.txt'
alias rsyncBackupIgnoreAttr='rsync -avhuz --no-perms --no-owner --no-group --progress --delete --log-file=rsyncBackupLog.txt'

-a: archive mode is -rlptgoD (no -A,-X,-U,-N,-H). -v: == --verbose. -h: human-readable. -u: transfer only if src has (newer timestamp) or (equal timestamp & different size). -z: == --compress during transfer. -P: == --partial --progress. --partial: keep partially transfered files in dest (will overwrite/delete.&.re-transfer by default).

OBS:
rsync folderA folderB will cp folderA into,under folderB.
rsync folderA/ folderB/ will cp folderA’s content into folderB.
Thus, /s after both folderX are mandatory.
Becareful with -u: it will ignore the dest file with newer timestamp.