I bet most of you have at least two computers. One of them is not connected to a LAN, but it is at home or in your briefcase as you travel. There is a great deal of discussion about replication these days, usually about copying data between database servers. Many users, however, have an urgent need for personal or individual replication to and back from the laptop.
Personal replication is more complicated than it appears.
But, most of these are less problematic when dealing with private data. It's going to one laptop and the user decides when to resynchronize. Whatever problems are encountered are magnified by the number of possible replication partners. If it were, we would have better product support already. Determining and replicating only the data that has changed is still a daunting task.