Dropbox Datalogger is a functional and extensible project to log environments using sensors attached to the Arduino Yun. This data is then saved to the SD card on the Yun, as well as uploaded periodically to a linked Dropbox account.
The 32u4 on the Yun does the sensing and calls methods on the Atheros Linux processor to execute Python scripts. The Python script takes care of authentication with Dropbox and upload of the Logfile.
Github Repository : Yun Datalogger with Dropbox