How to Communicate between servers and Overwrite the file

Hi,
I have this application where in a config file is modified as per the data entered by the user through some jsps.
Also, this application is also loaded on other server which may act as backup when the primary goes down.
Now,my issue is:
As soon as the file is modified i want to overwrite all the backup files on other backup servers, so that sync is maintained between all the files on all servers.
i guess the communication between primary & backup servers could be done using RMI.
I have gone through RMI tutorial & few examples on RMI but i'm not very clear where exactly the interface,impl and client program goes.
i mean how does this actually work in a real time.
Please could anybody shed some light on this.I would really appreciate.
Thanks!

Hi all can some one please give a solution ...Any suggestions would be greatly appreciated

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