You can download from this page the flow data used in the following paper:
- Drago, I. and Mellia, M. and Munafò, M. M. and Sperotto, A. and Sadre, R. and Pras, A. (2012) Inside Dropbox: Understanding Personal Cloud Storage Services. In: Proceedings of the 12th ACM Internet Measurement Conference - IMC'12, Boston, Nov. 2012
As described in the paper, the data was captured at 4 vantage points in 2 European countries. Most of the data were collected from March 24, 2012 to May 5, 2012. A second dataset was collected in Campus 1 in June and July 2012 to complement the analysis.
All data was captured using Tstat: an open source monitoring tool developed at Politecnico di Torino. Tstat export flow data containing more than 100 metrics. The source code of Tstat can be obtained from here.