I need to get back up copy of daily code changes that I made in SharePoint site. Is it possible? I have found back up options like taking back up of farm, site collection in central administration. will it take back up of my coding also? Which is best method to take backup of daily changes?
Best practice is to develop you customizations in Visual Studio as a solution. You back up your code with some source contol software like SVN or Team Foundation Server. Since your solutions are deployed as a wsp, you can save the packages easily. In case of restoring the farm you need to install and activate your solution again.