lftp/ftp/rsync

http://www.cyberciti.biz/faq/lftp-mirror-example/
http://networklessons.com/linux/lftp-stuck-making-data-connection/
http://crashingdaily.wordpress.com/2007/06/29/rsync-and-sudo-over-ssh/

First, you need to connect to the remote ftp server using the following syntax:
lftp ftp.cyberciti.biz

Type username and password:

lftp ftp.cyberciti.biz:~> user [email protected]
Sample outputs:

Password:
lftp [email protected]@rawlogs.bitgravity.com:~>
Type ls command to see a list of files:

lftp ftp.cyberciti.biz:~> ls
Sample outputs:

-rw-r--r--    1 80       www      36809419 Jun 24 23:59 2012-06-24.log.gz
-rw-r--r--    1 80       www      100912271 Jun 25 23:59 2012-06-25.log.gz
-rw-r--r--    1 80       www      102926055 Jun 26 23:59 2012-06-26.log.gz
To mirror all of the above files in the current directory, enter:

lftp ftp.cyberciti.biz:~> mirror
With mirror lftp command you can specify source directory to local target directory. If target directory ends with a slash, the source base name is appended to target directory name. Source and/or target can be URLs pointing to directories. The syntax is:

lftp ftp.cyberciti.biz:~> mirror source target
OR

lftp ftp.cyberciti.biz:~> mirror logs/ /data/wwwlogs
I highly recommend that you start mirror job with resume option. This make sure if ftp mirror was failed due to network connection it will only download partial file

lftp ftp.cyberciti.biz:~> mirror -c source target
OR

lftp ftp.cyberciti.biz:~> mirror --continue
To download only newer files (-c won't work):

lftp ftp.cyberciti.biz:~> mirror --only-newer
OR

lftp ftp.cyberciti.biz:~> mirror -n
You can speed up ftp mirror operation by downloading files in parallel using the following syntax:

lftp ftp.cyberciti.biz:~> mirror -p
To download 10 files in parallel, enter:

lftp ftp.cyberciti.biz:~> mirror --parallel=10
You can use pget to transfer every single file:

lftp ftp.cyberciti.biz:~> mirror -c  --use-pget-n=10