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With the current trend of offline applications and solutions as Joyent Slingshot or Rails2Exe to run a stand-alone offline client app written in Rails, we end up having a problem ahead of us: offline data gathering and synchronization back and forth to a main online server.
There is virtually no solution for that matter unless you use some proprietary and expensive package. Google Gears comes to mind but it acts more like a static client-side caching providing no real replication of data. So "acts_as_replica" was really made to scratch my own itch.
It was made for the scenario where you will have several clients working in an offline environment and then they"ll connect at the end of the day to get new data from the server and also send back what it collected through out the day.
This is a very opinionated software, meaning that it was