We are planning to implement SAP in our 3 companies located in three different cities. It was recommended to us to install R/3 servers at one location and connect users from other branches through communication lines. However, communication lines in our cities are not very stable and we are expecting frequent break down in communication lines. This disconnection will create problem in our sales operation in branches. As an alternate solution, can we install local SAP production server in City1, another production server in city 2 and , third production server in head office. During the day all user work on their local production servers and at the end of the day, we replicate data from city 1 & 2 servers to head office main server. Please advise Is it technically possible ??? what are advantage and disadvantage of this approach ??