What of $HOME/.IntelliJIdea14 is worth backing up?
As a habit, I backup many configuration files in $HOME. $HOME/.IntelliJIdea14 boasts hundreds of megabytes. I wonder if it's a good idea to back up the entire $HOME/.IntelliJIdea14 or could it be better to only back up parts of it. The main use for this is that if I need to reconsutrct an identical installation, backup of configuration files in $HOME/ sometimes make it easier.
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the directory .IntelliJIdea14/system/index take a lot of megabytes, i think you don't need to backup it, idea will index your project again when you start it.
You can backup only config and plugins if needed, system folder backup is not needed.