How to excluding directories in InteliJ IDEA (advanced)?

I know about «Project Structure | Module» but as it is it does not help so I am looking for some advanced informations.

Let me explain:

I have a lot of hidden «.backup» directories and adding them all in «Project Structure | Module» the is quite painful. An exclude pattern matcher would be nice. Perhaps a plug-in.

While painful it is not impossible to add all «.backup»开发者_运维问答 directories to «Project Structure | Module». If only the setting would stick. But they don't. I more or less have to fill them in once a day.

This could be because I develop alternating on Mac OS X and Windows. On maybe because I use Maven. Any issues or best practises I should be aware off?

Settings | File Types | Ignore files and folders.