Can you please show me one example?.where I have to use/app/data.Sorry sir i didn't get your point?
You would basically use git as with any other application you develop. Your developers will implement templates locally and push to the git repository the app/data folder.
Right now we are using mongo db as store for jsreport.but it is little expensive so I want to switch to file system (ie, fs store).Also by performance wise which one is better fs store or mongo db store?. please help
There is no single rule which one is better. With thousands of entities and in multi-server environments, its typically better to use full db like mongodb.