Backing up a linux machine remotely (another Linux Machine/Server)

If you need to backup your Linux Machine/Server to some remote place (another Linux Machine/Server), you may use the the following tools.

rsync (recommented) To find out more about rsync follow these links:

http://library.linode.com/linux-tools/utilities/rsync
http://blogs.warwick.ac.uk/chrismay/entry/idiots_guide_to/
And if you need an easy to be used GUI for rsync:

http://www.makeuseof.com/tag/grsync-simple-gui-rsync-easily-linux/
bacula - "Bacula is a set of Open Source, computer programs that permit you (or the system      administrator) to manage backup, recovery, and verification      of computer data across a network of computers of different kinds.  Bacula is relatively easy to use and efficient, while offering many advanced storage management features that make  it easy to find and recover lost or damaged files."
http://www.bacula.org/en/
http://www.bacula .org/en/rel-manual/Brief_Tutorial.html
http://www.linuxquestions.org/questions/linux-server-73/backup-using-bacula-662727/
http://www.linuxplanet.com/linuxplanet/tutorials/6585/1
scp -
http://en.wikipedia.org/wiki/Secure_copy