File sync / backup solutions

[ahmadof]

I want to sync a drive over a network (2 separate offices connected by a site-site VPN).

The two programs that seem to be the best are

http://www.econtechnologies.com/pages/cs/chrono_overview.html

and

http://www.qdea.com/synchronize_pro_x_intro.html

does anyone have experience with either? They both appear to do the same thing. Pros and cons of each?