The .metadata folder is the area where Eclipse plugins can save any information they want to keep. This will include things like preference settings and the index that the Java plugin uses to quickly find classes and methods.
It also includes a .log file where Eclipse logs errors.
What is stored there depends on the plugins you have installed (one of my plugins has a database in metadata), so it is recommended to create a backup copy (along with projects).
greg-449 Nov 15 '13 at 8:06 2013-11-15 08:06
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