Windows – rsync from Putty on windows to the Cent OS server

I'm not familiar with what out of band management a server from 1&1 might have but if there is anyway you can attach an ISO and boot from it the Microsoft DaRT (Microsoft Diagnostics and Recovery Toolset) ISO can reset the passwords.

http://www.microsoft.com/windows/enterprise/products/mdop/dart.aspx

While MarkM has a good point about DFS-R, if you want to still use rsync, then cwrsync is a great Windows version of rsync, which includes a client & server, and can also use encryption. I have used this package on Windows for years. It works great, but (in my experience) can sometimes have slower than expected file transfer times.