rsync
rsync --progress -av --delete /dir /remote_backup
hostname:/remote_backup から local:/local_backup/latest に転送
$rsync --progress -avz -e ssh --delete --bwlimit=200 user@hostname:/remote_backup /local_backup/latest
latestをYYYYMMDDに差分バックアップ
$rsync --progress --avz --delete --link-dest=/local_backup/2016010 /local_backup/latest /local_backup/201602